题目内容
For transistor action to take place the base-emitter junction must always be forward straight line.
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When the base current increases, large proportionate increases occur in the collector current.
A decrease of base current causes a large increase of collector-emitter voltage.
The collector-emitter voltage may be regarded as an alternating voltage superimposed on a steady direct voltage.
房屋建筑承重结构主要由哪些部分组成？
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