What is the theme of the story?
A.To show his happy family life.
B.To narrate his routine life.
C.To express his resent to his father.
D.To describe the way he was raised.
第2题
整流装置是将()的一种装置。
A.直流转换为交流
B.交流转换为直流
C.交流转换为交流
D.直流转换为直流
第3题
A.将380V交流电转换为220V直流电
B.将380V交流电转换为-48V直流电
C.将220V交流电转换为-48V直流电
D.以上答案都不正确
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