常用数学符号读法大全大写小写英文注音国际音标注音中文注音Ααalpha alfa 阿耳法Ββbeta beta 贝塔Γγgamma gamma 伽马Γδdeta delta 德耳塔Δεepsilon epsilon 艾普西隆Εδzeta zeta 截塔Ζεeta eta 艾塔Θζtheta ζita西塔Ηηiota iota 约塔Θθkappa kappa 卡帕ⅸιlambda lambda 兰姆达Μκmu miu 缪Νλnu niu 纽Ξμxi ksi 可塞Ονomicron omikron 奥密可戎∏πpi pai 派Ρξrho rou 柔∑ζsigma sigma 西格马Τηtau tau 套Υυupsilon jupsilon 衣普西隆Φθphi fai 斐Φχchi khai 喜Χψpsi psai 普西Ψωomega omiga 欧米伽常用数学符号大全1 几何符号↌ⅷⅶ↍↋ↆↄ△2 代数符号ⅴⅸⅹ～ⅼↅↇↈↃⅵↀ3运算符号×÷ⅳ±4集合符号ⅻⅺⅰ5特殊符号ⅲπ（圆周率）6推理符号|a| ↌ↂ△ⅶⅺⅻↅↆ±ↈↇⅰⅬⅭⅮⅯ↖↗↘↙ⅷⅸⅹ&; §↎↏←↑→↓↔↕↖↗ΓΔΘΛΞΟΠΣΦΧΨΩαβγδεδεζηθικλμνπξζηυθχψωⅠ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ Ⅺ Ⅻⅰ ⅱ ⅲ ⅳ ⅴ ⅵ ⅶ ⅷ ⅸ ⅹⅰⅱⅲ↚ⅳⅴⅵ↛ⅶ↜ⅷⅸⅹⅺⅻⅼⅽⅾⅿↀↁↂↃↄ↝ↅↆↇↈ↞↟↉↊⊕↋↌↠↍℃指数0123：o123上述符号所表示的意义和读法（中英文参照）＋ plus 加号；正号－ minus 减号；负号± plus or minus 正负号× is multiplied by 乘号÷ is divided by 除号＝ is equal to 等于号ↅ is not equal to 不等于号ↆ is equivalent to 全等于号ↄ is approximately equal to 约等于Ↄ is approximately equal to 约等于号＜ is less than 小于号＞ is more than 大于号ↇ is less than or equal to 小于或等于ↈ is more than or equal to 大于或等于％ per cent 百分之…ⅵ infinity 无限大号ⅳ (square) root 平方根X squared X的平方X cubed X的立方ⅿ since; because 因为ⅾ hence 所以ⅶ angle 角↍ semicircle 半圆↋ circle 圆○ circumference 圆周△ triangle 三角形↌ perpendicular to 垂直于ⅻ intersection of 并，合集ⅺ union of 交，通集ⅼthe integral of …的积分ⅲ (sigma) summation of 总和° degree 度′ minute 分〃 second 秒＃number …号＠ at 单价CNN) -- Kezai started receiving professional tennis coaching at the age of eight. Since then his father has worked hard to cover his training costs.Two years on and it all seems to have paid off. In June, a local Chengdu company reached out to Li Chengpeng, Kezai's father, with an offer to sponsor Kezai.Soon after, a professional photographer took pictures of Kezai and his father for advertisements. But the family's happiness was short lived. The company withdrew the sponsorship.Though he says he was never given an explanation, Kezai's father believes it was because of his political activity. The company could not be reached for comment.As a controversial blogger and writer, Li announced his plan to run for office as an independent candidate for China's National People's Congress of Wuhou District, a legislative body at the local level in Sichuan province."You never know the benefit of standing up if you always stay on your knees," Li declared in a campaign statement on his microblog, where he has more than three million regular followers. Through the power of social media, Li's original message was forwarded more than 3,000 times within a few hours on micro-blogging site Sina Weibo, a popular twitter-like service.But such campaigns are rare in China.The Chinese do not choose their own president or premier because all government officials are pre-decided.However, elections are held on the local level, with all candidates approved by the party beforehand.China's electoral law stipulates that every Chinese citizen over 18 has the right to vote and run in local elections. Those, like Li Chengpeng, seeking to become candidates for county or township legislatures must first register and secure confirmation of their candidacy. They must then be nominated as "deputy candidate" by political parties, social organizations or have the signed support of at least 10 registered voters in their constituency.In practice, the government can rule candidates or any of their supporters unqualified and refuse to put them on the ballot, which critics say leaves ample opportunity for manipulation of the results."I know nobody on the ballot sheet. And I don't think my vote will make much difference," a retiree in Beijing said when she was asked to vote for the People's Congress district's last election.In recent months, an unprecedented number of Chinese citizens have declared themselves as independent candidates, according to Li Fan, founder of the World and China Institute that promotes democracy at the local levels.He said many candidates have grievances with the local government and feel they cannot get their voices out."They bid for the position as they think they can draw attention from the public for better solving of the problem," he said."Some local governments did think that their leadership was threatened by these (independent candidates), which is obviously not the case." Li Fan said.Some believe there are concerns among the central government as well. On June 8, state-run media Xinhua quoted the head of the Commission for Legislative Affairs of the National People's Congress Standing Committee as saying that "there is no such a thing as an'independent candidate' as it's not recognized by law." All candidates must follow the guidelines laid out by the government.But some do manage to meet the guidelines and run under the banner of an independent. The history of China's independent candidates dates back to 1998, when Yao Lifa, a teacher in Hubei Province, became the first self-described independent candidate elected to the local congress. He lost out when attempting a bid for a second term in 2003.With the government in control of the media and potential candidates subject to government approval, many question whether a truly independent candidate can win. Li Fan says morethan 100 people -- many using the internet -- have declared themselves as candidates for upcoming elections for people's congresses across the country."There are no fair and free elections in China," said Li Fan. "Chances are not good for these people leading the wave, but with their appeals, a lot more people will stand out to join in the election. They are the future."No matter what the chances are for Li Chengpeng, he says he is determined. "In China, there is so much unfairness and many choices in life are decided by the others," he explained during an interview with CNN. "I want to make decisions on my own."To achieve his goal, Li Chengpeng has visited more than 100 residents in his constituency, listening to their appeals to work out his campaign plan, trying to secure thegovernment-required support from 10 registered voters. He also continues to speak out on his blog.Li Chengpeng is not sure whether his name will appear on the ballot in September, when the election process officially begins, but he tries to be optimistic. "I'm confident. If I'm not confident, how can I convince my supporters?" he said.Li Chengpeng is not so confident about securing another tennis sponsorship for his son, if his political activities indeed caused him to lose the first one. He says he plans to fight on as an independent -- and he has his son's support.。