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问题 单项选择题

某些晶体受到外力作用而发生机械变形时，在晶体的不同表面会产生符号相反的电荷，这种现象称被称为（）。

A.压阻效应

B.压电效应

C.霍尔效应

D.磁阻效应

答案

参考答案：B

填空题

和10000相邻的两个数是______和______．
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单项选择题

Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions.
Now, listen to the conversation.


What problem does the man have with the introductory poetry class

A．The class meets during his working hours.

B．The class is too far away.

C．He has another class at the same time.

D．He’s already familiar with the material.
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