单结晶体管的负阻特性是由于晶体管内部的反馈而形成的
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单结晶体管触发电路的触发功率比较大,一般用于触发大功率的晶闸管
A. 对
B. 错
_______, making some DIY things is fashionable.
A. Stand out
B. In one’s opinion
C. In my opinion
D. Out of fashion
Grandfather lives with us. We all ____ him.
A. look after
B. look at
C. look for
D. look like
Mr. Black was late because he _______ his way.
A. losted
B. lose
C. loses
D. lost