科技英语写作数词分数：Eight ninths 九分之八；three fifths 五分之三；seven tenths 十分之七；one seventh 七分之一；one fourth/a quarter 四分之一；one/a half 二分之一小数: a few tenths 零点几（十分之几）；a few hundredths 零点零几（百分之几）；a few thousandths 零点零零几（千分之几）；a few millionths 百万分之几表示：分数表示法+of a/an +单位（单数形式）例：seven parts per million=seven parts in 10的6次方百万分之七Three parts per thousand=three parts in 10的3次方千分之三A third part in 10的6次方百万分之三A seventh part in 10的3次方千分之七翻译：1.这只是汽化热的千分之几译：This is only a few thousandths of the heat of vaporization.2.这药丸重零点零几克。
译：This pill weighs a few hundredths of a gram.3.要使Vbe变化零点零几伏，就可以使基极电流发生明显的变化。
译：By varying Vbe only a few hundredths of a volt,the base current can be changed significantly.4.输出是输入的100倍。
译：The output is 100 times the input.5.其速度为光速的3/10。
译：Its speed is three tenths that of light.6.施加在该物体上的力为原来的2/5。
译：The force exerted on the body is two fifths what it was.7.这只箱子比那只重5倍。
译：This box is six times heavier than that one.8.该数值几乎比理想值大了3.5倍。
译：This value is nearly 4.5 times greater than the ideal one.9.这个音符的波长比在空气中同一音符长了两倍多。
译：The wavelength of this musical note is over three times longer than that of the same note in air. 练习1.该电路中的电流为电源的短路电流的一半。
The current in the circuit is one half the short-circuit current of the source.2.这种蓄电池的内阻仅为零点零零几欧姆。
The internal resistance of this kind of storage battery is only a few thousandths of an ohm.3.其误差为6/1012.Its error is six parts in 1012.4.这台计算机储存的信息比那台多3倍。
This computer stores four times more information than that one (does).5.月球的质量为地球的1/81。
The mass of the moon is 1/81 that of the earth.6.不久的将来对这种设备的需求量将为现在的20倍。
The demand for this kind of equipment in the near future will be 20 times what it is.7.这个元件上的电压为零点几伏特。
The voltage across this component is a few tenths of a volt.8.现在其内部的压力是原来的1/3。
Now its internal pressure is one third what it was.冠词练习一、1. There has been __ an___ ever greater interest in this subject.2. The power rating is the maximum power the resistor can safely dissipate without too great ___a __ rise in temperature.3. Its primary disadvantage is _an ____ increase in noise.4. _The____ successful design of the equipment requires __a__ detailed knowledge of the performance specifications.5. In _the____ Bohr model of the hydrogen atom, __a___ single electron revolves around _ a _ single proton in a circle of radius R.6.The unit of frequency is _the ____ hertz.7.If ___a__ voltage is applied across __a___ circuit, __an___ electric current will flow in __ the__circuit.8. __/__ Fig. 5-1 shows __/ ___ Oersted’s experiment.9. We should use _an____ 18-volt battery here.10._A___ machine is _ a____ device for transmitting force to accomplish _ a_ definite purpose.11. __The__ hydraulic press will be considered in __/ __ Chapter 14.12._The___ study of fluids in motion is one of __the___ more difficult branches of mechanics because of __ the___ diversity of phenomena that may occur.13.It is easy to determine ___the_ value of _ the(/)____ parameter μ.14.By _ /_ Eq. (2-1) we have __ the ___ following relation.15.It is necessay to use __an ___ S-shaped tube here.16.The authors work at __the___ University of Texas at __ / ___ Arlinton.17.This is ___an __ R-bit transformer.18.__An ___ XOR gate must be used here.II、将下列句子译成英语 注意正确地使用冠词1、这是一个h参数。
This is an h parameter.2、现在我们转向讨论一下局域网.We turn now to a discussion of local area networks.3、质谱仪是与光谱仪一样重要的仪器。
The Bainbridge mass spectrometer is as important an instrument as the optical spectrometer.4、必需求出为使一个电子通过这一段导线需要多长的时间。
It is necessary to find out how long a time is required for an electron to travel the length of the wire.5、物质的密度是其每单位体积的质量。
The density of a substance is its mass per unit volume.6、地球的半径为6.37×106米。
The radius of the earth is 6.37×106m.7、这两个参数是相同的。
The two parameters are the same.8、压力的增加总会引起体积的减少。
An increase in pressure always causes a decrease in volume.9、图2-5画出了式2-2所表示的情况。
Fig.2-5 shows what is expressed by Eq.2-2.10、电感的单位是亨利。
The unit of inductance is the henry.11、输入信号太大会引起非线性失真。
Too large an input signal can cause nonlinear distortion.12、利用斜率的定义，我们能导出表示直线的方程。
Using the definition of slope, we can derive the equation which represents a straight line.13、f (x+h)-f(x)这一表达式经常用在学习微积分中。
The expression f(x+h)-f(x) is frequency used in the study of caculus14、能写成以下形式的方程被称为含有一个未知数的线性方程。
An equation which can be written in the following form is known as a linear equation in one unkown.15、在计算机中 趋势是以尽可能高的时钟速率工作。
In a computer, the tendency is to operate at as high a clock rate as possible.16、锡的熔点没有铅的高。