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问题 多项选择题

使用指针式万用表欧姆档测量电阻时，每档都应指针调零后方可测量，其原因是（）。

A.每档的电压变化

B.每档的阻抗不同

C.各档内阻有变化

D.表头内阻不一

E.不同的电阻档表内电流不同

答案

参考答案：A, C, E

单项选择题

As a conductor, Leonard Bernstein is famous for his intensely vigorous and exuberant style.

A．extreme

B．enthusiastic

C．prosperous

D．nervous
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单项选择题

Which of the following is the most likely result of a technological improvement in a perfectly competitive industry（）

A. Individual firms’ supply curves shift to the left.

B. The industry supply curve shifts to the right.

C. The costs for individual firms increase.
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