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问题 单项选择题

大型X线机的供电电源多数是

A．单相110V
B．单相220V
C．两相200V
D．两相380V
E．三相380V

答案

参考答案：E

解析：大型X线机的供电电源多数是三相380V。

选择题

——Don’t you agree with what he said at the meeting?

——Yes, _____! It can’t be better.

A．approximately

B．incredibly

C．probably

D．absolutely
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选择题

The two ladies are ________ the same age, but there seems to be ten years ________ them.

A．at, between

B．about, among

C．as, among　　　　　　　　　　

D．of, between
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