GMDSS英语阅读附加题1.Which transmissions are permitted on the fregency 2174.5KHz inNBDP service?A.Disdress and safety traffic using narrow hand direct printingtelegraph exclusively.B.Transmissions of information regarding the safety of navigation andweather warnings.C.Distress and safety traffic in radiotelephonr.D.Tranmissions of the international NAVTEX system.2.For COSPAS-SARSAT system ----------usually transmit initialCOSPAS-SARSAT alert .A.RCCB.MCCC.LUTD.MRCC3.Ships equipped with Inrnarsat SES send dirress alerts both-----------A.quick and goodB.convenient and certainC.easily and simplyD.important and difficult4.NAVAREA warnings generally concern information -----------.A.in coastel watersB.in offshore watersC.within the limits of a harbourD.which the ocean-going ship does not require5. A ship arion on receiving a shore to ship distress alert shouldA. keep silienceB. interferes with communicationC. establish communication as direct render such assistance as is required and appropriareD.refuse communication as directed and render such assistance as of regulation and appropiace6.If a ship in accoridance with the requirements of regulation 10.1.1(of the amendments to the 1974 SOLAS Convention ),is fitted with an INMARSAT MES , while at sea shall maintain continuous-watch ------------A. on 8.414.5KHzB. on at least one of the following HFDSC frequencies :4207.6112.12577 or 16804.5KHzC. on 2174.5KH.zD. on satellite shore to ship distress alerts7.----------is a station in the mobile aervice ,which is used in distress and which transmits siginals to facilities SAR operation ,and which is not used 90Hz frequency bandA. SARTB. EPIRBC. DSCD. GPS8. The other part of an SES is communication or electronics and controlier ,which is refered to as BOE, because this part is located -----------A. high up on the vesselB. inside the vesselC. exterior the vesselD. above deck9. Distress signal is always stored in memey so as to start --------A. Local-mode coverageB. SAR operationsC. Date processD. Continuous broadcast10. The ---------is the nerve center of INMARSAT system ,and it is located in the INMARSAT headquarters’ building in LONDONA. SESB. CESC. OCCD. NCS11. Which are the preferred frequencies in radiotelephony for on scene communications?A. 121.5MHz and 2045KHzB. Ch 70(156.525MHz)and 2174.5KHzc. CH11(156.650MHz)and 2021KHzD. Ch16(156.800MHz) and 5182KHz12. The chapter IV of SOLAS Oonvention is about -----------A. maritime radio-communicationsB. navigational regulationsC. terms and definitionsD. GMDSS instructions13. SOLAS vessel should be able to communicate with shore station ----------A. no matter what they are and what time it isB. at scheduled time and in major ocean regionsC. at fixed time and positionD. when they get permission14. SOLAS ships should keep a continuous listening which on ----------A. CH16B. 2182KHZC. 121.5MHZD. Ch 7015. SOLAS vessels fitted with a maritime VHF installation should maintain watch on ---------A. channel 13B. channel 70C. channel 8D. 2182KHz16. MSI is received by ships on a designed channel, ”designed” means -----------A. allocatedB. appointedC. designedD. specialized17. What means are used to prevent the reception of unwanted broadcast by vesseis utilizing the NAVTEX system?A. Operating the receiver only during daytime hoursB. Programming the receiver to reject unwanted broadcastsC. Coordinating reception with published broadcast schedulesD. Automatic receiver de-sensitization during night hours18. -----------is a maritime mobile service in or near a port between coast stations and ship stations or between ship stations ,in which messages are restricted to those relating to the operational handling ,the movement and safety of ships and ,in emergency ,to the safety of persons ,it does not include public correspondence.A. Distress TrafficB. Medical AdviceC. Emergency communicationD. port Operations service19. What shall be transmitted to avoid all ships in a large sea area-being alerted?A. area callB. distress callC. urgency callD. DSC call20. In addition to meeting the requirement of Sea area A1and A2 ,every ship engaged on voyage in Sea area A4 shall be provided with -----------A MF radio installation with DSCB. SESC. MF/HF radio installation with DSCD. 2187.5KHz watch receiver21. When activated in a distress station ,SART should provide survivors -----------, when it is interrogated by a radar .A. 20 blipsB. special rad imagineC. visual and audible indicationD. straight line22. W hat is the meaning of a Subscriber’s NumberA. The selective calling number assigned to the vesselB. The number assigned to a subscriber’s telephone, TELEX, etc.C. The number assigned to the vessel by the U.S. Coast guardD. The station’s call sign23. Every ship shall carry personnel qualified for---------to the satisfaction of the AdministrationA. distress and safety radiocommunication purposesB. life-saving purposeC. GMDSS requirementsD .emergency position24. The abbreviation WWNWS meansA. WORLD WIDE NETWORK WARNING STATIONB. WORLD WIDE NAVIGATIONAL WARNING SERVICEC. WORLD WIDE NUMBER WATCH STATIOND. WORLD WIDE NETWORK WATCH SERVICE25. Radio telephone stations should be in the upper part of the ship and be located away from noise that could _____ the quality of communications.A. degradeB. decreaseC. ensureD. warrant26. EGC Safety Net transmits _____ types of messages for mariners.A. fourB. sixC. fiveD. three27. A Navtex station in each NAVAREA is usually allowed to have _____ four transmission.A. 10 minutes every 4 hoursB. half an four every other hourC. irregular period of timeD. 5 minutes every two hours28. Tradition radio system has so many principle problems which _____.A. can be tackled by traditional and terrestrial techniquesB. can be solved by satellite communicationsC. can be tackled by some other techniques except satellitesD. can hardly solved by any other techniques29. ______ is the orbit of a geosynchronous satellites whose and direct orbit lies in the plane ofThe Earth’s equator, and it is approximately35, 700 kilometers above the equator.A.Polar OrbitingB.GPS Satellite OrbitC.Geostationary Satellite OrbitD.The North and South Poles30. DSC distress relays can be transmitted by either ______ or ______ .A. a coast station/a ship stationB, an EPIRB/a SARTC. ARQ/FECD. a back-up satellite / a land SAR unit31．______ will form the basis for distress alerting and safety calling . A, GMDSSB. EGCC. MSID. DSC32. With the help of modern technology, ships are able to receive autorn messages _____A. by day or at nightB. almost round the clockC. somewhat and sometimeD. from sunrise to sunset33. The letter D is abbreviation for the word distress in_____A.ADEB.GMDSSC.NBDPD.DSC34. It is _____for marines to combine the SART with a float-free satellite EPRID.A. essentialB. compulsoryC. optionalD. inadvisable35. _____ indicates that a ship is distress and requires immediate assistance.A. Distress trafficB. Urgency trafficC. Safety trafficD. Routine message36. Which system is often used to provide accurate vessel positioninformation to the GMDSS equipment?A.GPSB.COSPAS-SARSTC.EPIRBD.INMARSAT-F37. Both the satellite communication and terrestrial communications will______?A. not be used in the GMDSSB. be used only for general communicationsC. be replaced by MorseD. be used in the GMDSS38. Ships in the area A2 will at least transmit a ship-shore alert on _____and satellite EPIRB.A. 2182 KHzB. 2174.5 KHzC. 2187.5 KHzD. 156.8 MHz39. Only the polar regions, where shipping is infrequent, are not covered, In this sentence, ‘shipping’ means _____.A. shipsB. shipping industryC. navigation of shipsD. shipping company40. How long will the SART operate when in stand-by condition?A. 86 hoursB, 20 hoursC. 55 hoursD. 96 hours41. In NAVTEX service, the subject indicator characters A means _____.A. meteorological warningsB .navigational warningsC .search and rescue informationD .meteorological forecast42 .The safety radio certificate for the cargo ship is issued_______.A .by the radiotelegraphy authority of a countryB .in accordance with the government regulationsC .by complying with the provisions of the international conventinnsD .under the provisions of the SOLAS convention43. In the NAVTEX service, three message priorities are used. They are________.A. Distress Urgency and RoutineB. Navigation Warning, Weather Report and GeneralC. Distress, safety and Urgent prioritiesD. Vital, Important and Routine44. Which one of the following NAVTEX questings is false?A. NAVTEX is a single frequency NBDP system that transmits FFS broadcasts on 518KHzB. A selective message-rejection feature of the receiver allows the mariner to receive only thatSafety information pertinent to his requirements.C. NAVTEX is broadcast only in the local language of the cast station and adjacent NAVAREAs.D. NAVTEX carries information relevant to all sizes and types of vessels within a region establishied for this service.45. Which of the following statement is true?A. NAVTEX stations have the transmission power.B.NAVTEX stations can transmit at the same timeC. every NAVTEX stations have the different identification characters in each NAVAREAD. There are 24NAVTEX stations in each NAVAREA46. EPRIB batteries must be clearly________with their expiry date, the serial number and the identificatong code.A. notedB. writtenC. markedD. notified47. An”area call” is usually applied to________.A. alert all ships in a limited sea areaB. all shipsC. send the alert to ships in vicinity of distress incidentD. several ships48. _______has the right to impose silence on stations which interfere with distress traffic.A. CESB. RCCC. OSCD. SES49. Radio beacon can be activated_______in case of distress.A Only sutomaticallyB. Only manullyC. Both automatically and manuallyD. Only by remote control50. In the communication of INMARAST, ______communication has the absolute priority over all other transmissions.A. routineB. distressC. urgencyD. security51. Which mode of INMARSAT Standard-B communications may be possible with lower received signal strength?A. FaxB. TELEXC. Voice Communications, compandors offD. Voice Communications, compandors on52. Every ship must be fitted with_______SART, and_______two-way VHF radio telephone.A.1, 2B.2, 3C.2, 1D.3, 253. The transmission for entertainment purposes and unnecessary talking are________.A. not allowedB. sometimes allowedC. forbiddenD. stricty forbidden54. In the GMDSS,MSI broadcast will be made on two dedicated systems: _______and_______A. NBDP\VHF radioB. Inmarsat safetyNET\NAVTEXC. Safety service\Inmarsat-AD. Long range\short range55. NAVTEX Receivers also use the B2 character to_______differentclasses of messages.A. identityB. REJECTC. print outD .correct56. The frequency 518KHz will be used to tranamit_______and________warnings in NAVTEX.A. navigational\typhoonB. traffic\meteorologicalC. marine\hurricaneD. navigational\meteorological57. How many MF frequencies are available for DSC distress-related calls?A. OneB. TwoC. FourD. Five58. MCC is the abbreviation for Mission_______Centre.A. CorrectionB. CertificateC. ControlD. Calling59. Which of the following function that is not fulfilled by INMARSAT-C?A. distress alertingB. store-and forward messagingC. receipt of EGC messagesD. telephone communication60. There are_______NCSs in total, one in each ocean region, the AOR (E andW), IOR and POR.A. 3B. 2C. 1D. 461.________is the united nations agency responsible for the Radio Regulations among other things.A. ITUB. IMOC. MSCD. WMO62. In areas covered by Inmarsat HF can be used as an________to satellite communications.A. alterationB. alternativeC. alterD. alert63. An area within the coverage of at least one VHF shore station which continuous DSC distress alert is vavilable is ________.A. Sea Area A1B. Sea Area A2C. Sea Area A4D. distress Area64. There is actually an overlapped area of three ocean regions somewhere in the world. It is an overlap of _______and_________.A. IOR, AOR(E)\PORB. POR, AOR(E)IORC. AOR(E), AOR(W)\IORD. AOR(W),IOR\POR65. Frequencies for receiving MSI (Maritime safety information) intermationally are_______A. MF NBDP frequencies specified for MSIB. MF SSB frequencies specifified for MSIC．HF NBDP frequencies specified for MSID．HF SSB frequencies specified for MSI66．The position of the POR satellite in the Inmarsat system is ______ above the equator.A.55.5WB.64.5WC.15.5WD.178E67．What is the minimum personnel requirement of GMDSS ships trading in sea area A2?A．Restricted Operator’s CertificateB．General Operator’s CertificateC．Second Class Radio Electronic CertificateD．First Class Radio Electronic Certificate68．What equipment is utilized to transmit Enhanced Group Calls？A．COSPAS satelliteB．HF SITOR shore stationsC．NAVTEX shore stationsD．INMARSAT satellite69．There are ______ NCSS in total, one in each ocean region, the AOR(E and W), IPR and POR.A．3B．2C．1D．470．The INMARSAT safety-net service covers ______.A．the whole worldB．all NAVAREASC．areas from A1 to A2D．only four Inmarsat regions71．A person ______ in spite of being in an extremely dangerous situation is a survivor.A．whom is still aliveB．who is safetyC．who is healthyD．who continues to live72．What is the minimum GMDSS personnel requirement of ships with Shore-Based Maintenance method operating in sea area A1？A．Restricted operator’s certificateB．General operator’s certificateC．Second class radio electronic certificateD．First class radio electronic certificate73．Thermal printing paper, used in many NAVTEX receivers should be protected from ______.A．Radiated frequencyB．Audio frequencyC．Magnetic fluxD．Light74．In the COSPAS-SARSAT, satellite EPIRBs function on the frequencies of ______.82．There are ______ NAVAREAs designated by IHO and IMO all over the world.A．13B．4C．16D．1283．An area within the coverage of INMARSAT satellites in which continuous distress alerting is available is ______, excluding area A1 and A2.A．sea area A3B．sea area A2C．distress areaD．GMDSS areas84．The quality of EGC message is ______ affected by the position of the ship, the time of reception and climate conditions. A．sometimesB．all timesC．neverD．partly85．How many MF frequencies are available for DSC distress-relatedcalls?A．OneB．TwoC．FourD．Five86．Ships at sea are in urgent need of MSI because they are ______ various kinds of danger.A．subject forB．liable toC．easy to meetD．always encounter87．What frequencies are used for receiving HF MSI?A．HF MSI is transmitted on a primary frequency of 518kHz and a secondary frequency of 490kHz.B．HF MSI is transmitted on 8414.5kHz plus one other (undesignated)HF frequency.C．HF MSI is transmitted on the third ITU channel in each HF band (2,4,6,8,12,16 and 22MHz)D．HF MSI is transmitted on certain dedicated frequencies. 88．Which statement is false regarding the transmission of maritime safety information?A．In the mainland of China, 518kHz and 490kHz frequencies are used in NAVTEX services.B．In Taiwan province of China, 518kHz and 490kHz frequencies are used in NAVTEX services.C．518kHz,4209.5kHz and 490kHz are all NAVTEX frequencies. D．the frequencies of 4210kHz,6114kHz,8416.5kHz,12579kHz,16806.5kHz,22176kHz and 26100.5kHz are not used in NAVTEX services.89．In INMARSAT system, each LES provides, as a minimum, ______. A．telephoneB．telephone and telexC．telephone, telex and facsimileD．telephone, telex, facsimile and data90．The following radio communication systems are used in GMDSS except the INMARSAT system ______.A．VHFB．VHF MF and HF terrestrial systemsC．the COSPAS-ASRSAT systemD．the FLAG SINGAL system91．Which of the following statement is true?A．NAVTEX stations have the transmission powerB．NAVTEX stations can transmit at the same timeC．Every NAVTEX stations have the different identification characters ineach NAVAREAD．There are 24 NAVTEX stations in each NAVAREA92．In a properly functioning MF/HF DSC system, the receiver bandwidth should be ______.A．sufficiently wide to pass video pulsesB．1.7kHzC．as narrow as possible, but not less than 170HzD．300Hz maximum93．What is the least expensive per-minute call make via INMARSAT Standard-B?A．Ship to Shore FaxB．Ship to Ship VoiceC．Ship to Shore TELEXD．Ship to Ship TELEX94．Every ship, while at sea, shall maintain a continuous watch on ______ if the ship is fitted with an MF radio installation.A．2182kHzB．156.8MHzC．2187.5kHzD．2182.5kHz95．There are ______ for ships to receive SafetyNet message. A．some chargeB．a few chargeC．more expensiveD．no charge96．The initial distress message can be retransmitted on NAVTEX using subject indicator character ______.A．DB．AC．BD．C97．For communication between two stations the ______ mode should be used when available.A．ARQB．FECC．SEL-CALLD．EGC98．What should a GMDSS operator do if a NAVTEX warning message is received but it contains too many errors for it to be usable? A．Vital message will be repeated.B．Contact the NAVAREA coordinator and request a repeat broadcast, then the message concerned will be repeated at once.C．The hurric ane will be upon the vessel, they’re in big trouble. D．Listen to appropriate VHF weather channel for repeat warnings.99．What immediate remedy can be used to correct shadowing of the satellite signal by a shipboard obstruction?A．Relocate the mast or other obstructionB．Raise the transmit power levelC．Change the ship’s courseD．Increase the receiver gain100．What does ITU stand for?A．the International Telephone UnionB．the International Telecommunication UnionC．the International Telecommunication UnitD．the International Telex Unit101．INMARSAT is composing of ______.A．CES, SES, SatelliteB．Satellite, NCE, OCC, CES and SESC．SES, Satellite, coast stations and NCCD．SES, CES, coast station102．It is required that ships proceeding at sea should keep continuous watch on ______.A．BHF channels 16 and 13B．Appropriate DSC distress and safety frequenciesC．INMARSAT TDM message channelD．VHF channel 70 and channel 8103．Distress alerts will be relayed on the ______ when the RCC considers it necessary.A．Dedicated systemB．MSI broadcastsC．518kHzD．Channel 16104．Where are the operational details of NAVTEX stations to be found? A．ITU List of Ship StationsB．IEC Publication 945, Marine Navigational Equipment C．Admiralty Lists of Radio Signals, Volume IIID．Frequency allocation Tables105．Shipborne satellite EPIRBS capable of being activated ______ on floating free from a sinking ship.A．only manuallyB．only automaticallyC．manually or automaticallyD．by remote control106．Every ship must be fitted with ______ SART, and ______ two-way VHF radio telephone.A．1, 2B．2, 3C．2, 1D．3, 2107．Ships sailing in ______ are able to receive and print out EGC messages.A．fix area or Navarea in any ocean regionB．a Navarea or weather forecast areaC．any designated area or given geographic position under the INMARSAT satellitesD．anywhere of the world108．Which of the following equipment is excluded from the required GMDSS equipment?A．9GHz SARTB．weather FAX receiverC．L-EPIRB or 406MHz EPRIBD．BHF DSC watching receiver109．______ is the orbit of a geosynchronous satellite whose circular and direct orbit lies in the plane of the Earth’s equator, and it is approximately 35,700 kilometers above the equator.A．Polar OrbitingB．GPS Satellite OrbitC．Geostationary satellite OrbitD．The North and South Poles110．Which of the following statements is true？A．The SRAT can be auto-operated in vertical position some time. B．The SRAT can be auto-operated in a parallet position at any time. C．The SRAT can be auto-operated under the water sometimes. D．The SRAT can be auto-operated in float-free position when combined with EPIRB.111．If a ship is in distress in Area A3, ship-to-shore distress alerting shall be conducted by means of ______.A．MF DSCB．HF DSCC．2182R/TD．SART112．Which characters are sent by the ship station to indicate a desire to send a weather observation message?A．OBS+B．MSG+C．AMV+D．OPR+113．The first communication satellite was used for the purpose of ______.A．taking the place of the f radio systemB．introducing a new life-saving systemC．saving the vessels in distressD．improving the communication114．The position if the IOR satellite in the INMARSAT system is ______ above the equator.A．64.5EB．178EC．15.5WD．54WA 115.NAVES Receivers also use the B2 character to____ different classes of messages. AA. identifyB. rejectC. print outD. correctD 116.According to the basic concept of GMDSS, ____can be rapidly alerted to a distress incident.A. only SAR autorities on landB. all ships in a very large sea areaC. the nearest coast stations and port radiosD. the SAR authorities ashore as well as ships in the vicinity of the casualtyB 117.Which of the following indicates a grave and imminent danger requesting immediate assistance on the radio telephone?A.TTB.MAYDAYC.SECURITED.PAND 118.VHF telephone equipment should be able to send and receive DSC message on channel____.A.6B.13C.16D.70A 119.What shall be transmitted to avoid all ships in a large sea area being alerted?A. area allB. distress callC. urgency callD. DSC callC 120.The WWNWS establishes three types of navigational warning:____.A. Distress Urgency and SafetyB. Vital, Important and RoutineC. NAVAREA, Coastal and LocalD. Gale, Tsunami and IceC 121.Which of the followings is not among the functions of SOLAS ships?A. receive shore-to-ship distress alertingB. transmit ship-to-shore distress alertingC. receive message for public correspondenceD. transmit and receive locating signalsA 122.____ consists of all messages relating to the immediate assistance required by the ship in distress.A. Distress trafficB. Urgency trafficD 669.The general benefit of the GMDSS is to ______.A. enable SAR operations to start with minimum delayB. give facilities to marine communicationC. reduce sharply the chances of ship’s sinkingD. both A and CA 670.The GMDSS is composed of _____A. satellite and terrestrial communication systemsB. only navigational and alerting systemsC. just MSI system and locating systemD. SAR co-ordination systemD 671.The GMDSS must combine all various subsystems, because____.A. they all have different limitations with respect to coverageB. they all have different limitations in the technology they useC. different systems apply to different shipsD. all of aboveD 672.The INMARSAT consists of_____ major components.A.4B.9C.8D.5D 673. The INMARSAT safety-net service covers_____.A. the whole worldB. all NAVAREASC. areas from A1 to A2D. only four Inmarsat regionsB 674.The NCS of Inmarsat-A system in the IOR is in____.A. Goonholly, UKB. Yamaguchi, JapanC. Perth, AustraliaD. Southbury, USAA 675.The NCS of Inmarsat-A system in the AOR-E is in_____.A. Goonholly, UKB. Yamaguchi, JapanC. Perth, AustraliaD. Southbury, USAA 676. The maritime access code for the AOR-E is _____ in Inmarsat-A Telex Service.A.581B.582C.583D.584A 677.The Network Coordination station for the Inmarsat-A coast stations in the Pacific ocean region is in _____.A. Yamaguchi, JapanB. Beijing, ChinaC. Nakhodks, RussiaD. Perth, AustraliaB 678.To establish a communication channel for the telex service in the Inmarsat-A terminal, you should first_____.A. establish a communication channel from the CES, via the International Telex Network to the final destinationB. set up a communication channel from your SES, via a satellite , to a CES within your ocean regionC. set up a channel directly to the addressee at the destinationD. establish a channel from your terminal, via the International Telex Network to a CES within your ocean regionD 679.The maritime access code of telephone mode in Inmarsat-A Terminal for the AOR（W）is_____.A.871B.872C.873D.874C 680.The maritime access code of telephone mode in Inmarsat-A terminal for the IOR is ____.A.871B.872C.873D.874C 681.When you have received GA+ form the CES for the Inmarsat-A telex communication, you should immediately select_____ and ______you required.A. an CES/telex modeB. an SEC telex serviceC. the service /the subscriberD. a satellite /an ocean regionA 682.In Inmarsat-A,“Priority 0”means______ communication.A. routineB. distressC. urgencyD. safety1A 2C 3C 4B 5C 6D 7B 8B 9D 10C 11D 12A 13A 14A 15B 16B 17B 18D 19A 20C 21C 22B 23A 24B 25C 26A 27A 28B 29C 30A 31D 32B 33B 34C 35A 36A 37D 38C 39C 40D 41B 42D 43D 44C 45C 46C 47C 48B 49C 50B 51B 52B 53B 54B 55A 56D 57A 58C 59D 60D 61A 62B 63A 64C 65A 66D 67B 68D 69D 70D 71D 72A 73D 82C 83A 84C 85A 86C 87D 88A 89D 90D 91C 92D 93C 94A 95D 96A 97A 98A 99C 100B 101B 102B 103B 104C 105C 106B 107C 108B 109C 110D 111B 112A 113D 114 A 115A 116D 117B 118D 119A 120C 121C 122A 669B 670A 671B 672D 673D 674B 675D 676A 677A 678B 679D 680C 681C 682C．HF NBDP frequencies specified for MSID．HF SSB frequencies specified for MSI66．The position of the POR satellite in the Inmarsat system is ______ above the equator.A.55.5WB.64.5WC.15.5WD.178E67．What is the minimum personnel requirement of GMDSS ships trading in sea area A2? A．Restricted Operator’s CertificateB．General Operator’s CertificateC．Second Class Radio Electronic CertificateD．First Class Radio Electronic Certificate68．What equipment is utilized to transmit Enhanced Group Calls？A．COSPAS satelliteB．HF SITOR shore stationsC．NA VTEX shore stationsD．INMARSAT satellite69．There are ______ NCSs in total, one in each ocean region, the AOR(E and W), IPR and POR. A．3B．2C．1D．470．The INMARSA T safety-net service covers ______.A．the whole worldB．all NA VAREASC．areas from A1 to A2D．only four Inmarsat regions71．A person ______ in spite of being in an extremely dangerous situation is a survivor. A．whom is still aliveB．who is safetyC．who is healthyD．who continues to live72．What is the minimum GMDSS personnel requirement of ships with Shore-Based Maintenance method operating in sea area A1？A．Restricted operator’s certificateB．General operator’s certificateC．Second class radio electronic certificateD．First class radio electronic certificate73．Thermal printing paper, used in many NA VTEX receivers should be protected from ______. A．Radiated frequencyB．Audio frequencyC．Magnetic fluxD．Light74．In the COSPAS-SARSA T, satellite EPIRBs function on the frequencies of ______.。