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问题 单项选择题

某66kV架空电力线路档距为140m，请计算导线与地线在档距中央的距离应大于或等于（）。

A.1.88m

B.2.25m

C.2.68m

D.3.15m

答案

参考答案：C

问答题

就a，b的不同取值情况讨论方程组
[*]
何时无解、何时只有唯一解、何时有无数个解，在有无数个解时求其通解．
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阅读理解

根据短文内容,判断下列句子正(T)误(F)

There are four people in my family. My father is a police officer. His work is kind of dangerous. He's very busy. He often has meals outside. Sometimes we can't see him all day. But I love him very much. My mother is a bank clerk, but she wants to be a reporter. She says her job is boring and being a reporter is interesting, because she can meet many interesting people. My brother is a waiter. He likes his work, because he thinks he can meet many new friends when he works.

I'm a middle school student. I study hard because I want to be a teacher. I think it's not difficult for me.

小题1:My father works in another（另一个）city, so we can't see him all day sometimes.

小题2:My mother likes to be a bank clerk.

小题3:My mother wants to be a reporter, because she wants to meet many interesting people.

小题4:My brother works in a restaurant. He likes to make new friends.

小题5:I want to be a teacher. I think it's difficult for me.
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