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问题 多项选择题

以下哪些是引起卷绕机DC-BUS低压故障点（）。

A、A20损坏

B、540V模块陷入

C、变频器短路

D、电机异响

答案

参考答案：A, B, C

选择题
看图，选出与图片相符的句子。
( ) 1. A. Our English teacher is from Canada.
B. Our English teacher is from America.
( ) 2. A. The students are very strict.
B. The students are very active. 
( ) 3. A. He is tall.
B. He is short.
( ) 4. A. She is young and strict.
B. She is old and kind.
( ) 5. A. My brother is very funny.
B. My sister is very quite.
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选择题

Keep yourself confidence up by taking gradual steps forwards, rather than freezing, when ______ with what seems like great trouble.

A．to face

B．face

C．facing

D．faced
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