题目内容

普通晶闸管的额定电流是用什么电流表示?

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当阳极电流小于什么电流时,晶闸管才会由导通转为截止?

Water and oxygen are basic needs for human beings to _________ their lives.

She is one of the strongest __________ of tax reform.

I’ve never seen droughts on such a large ____________.

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