题目内容

When the base current increases, large proportionate increases occur in the collector current.

A. 对
B. 错

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A decrease of base current causes a large increase of collector-emitter voltage.

A. 对
B. 错

The collector-emitter voltage may be regarded as an alternating voltage superimposed on a steady direct voltage.

A. 对
B. 错

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十七十八世纪，兴起于欧洲的学校体育教育开启了体育社会现象专门化大门。的出现使体育社会现象的专门化有了。