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【判断题】
因为表头是直流表,所以机械万用表测测交流电压时,需加装一个并、串式半波整流电路,将交流进行整流变成直流后再通过表头,这样就可以根据直流电的大小来测量交流电压。扩展交流电压量程的方法与直流电压量程相似。A.
正确
B.
错误
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【简答题】如何用验电笔或 400V 以上 测出三相四线制 供电线路上的火线和零线?
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【单选题】— How did you feel when you got the first prize. — It made me ______ proud. [ ]
A.
feel
B.
felt
C.
feeling
D.
to feel
【单选题】Did you feel your should __ by his hand?
A.
touch
B.
touched
C.
to touch
D.
to be touched
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