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问题 单项选择题

按照公司规划，力争（）基本建成“一强三优”现代公司，初步建成世界一流电网、国际一流企业。

A.2012年

B.2013年

C.2015年

D.2020年

答案

参考答案：C

改错题

Nick is a 28-year-old Australian man, which life is very difficult because he born without arms or legs.  Some people used to make fun of him and said he looked like a monster. Doing normal things seemed impossibly to him. However, Nick never gave up, and after many failures, he finally learn to swim, fish and even surf. Most surprising, he completed university and earned the two degrees. Now he is the CEO of two company.

When asking about the secret of his success, Nick’s answer is:  Attitude is altitude. To him, nothing is impossible if you has enough determination to overcome difficulties. He thinks a positive attitude is the key of success.
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材料题

阅读下段文字，用一个单句为“光纤通信”下一个简练、准确的定义。（不超过25个字）

　　一提起光通信，人们自然会联想到中国古代的烽火台。的确，现代光通信，就是利用光学及光电学的现代技术改造古代通信的结果。六十年代初的通信还与烽火台的通信极为相似；光在空中传输，利用光的通断或强弱，将一地的信号传到另一地。但是，空中的薄雾，战场的烟尘，都可以阻断这种光通信。为此，人们转而研究用光导纤维来传递光信号。这种通信方式就叫做光纤通信。光纤通信所采用的现代技术主要是电光转换及光电转换技术。半导体制成的发光器件被接通电流后，经过能量转换会辐射出光波。电信号于是变成了光信号。发光器件的发光面极小，这样可使光束易于有效地输进与它相连的光纤中。接收端的半导体光电器件接收了从光纤传来的光信号，经过能量转换而产生与光信号相应的光电流，光信号于是又变成了电信号。

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