题目内容

工作在放大区的某NPN型BBT,如果当IB从12μ变为22μA时,IC从1mA变为2mA时,那么它的β约为( )

A. 60
B.80
C.100
D. 50

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三极管由两个PN结构成,二极管包含有一个PN结,因此可以用两个二极管反向串接来构成三极管。

A. 对
B. 错

三极管集电极和基极上的电流总能满足IC=βIB。

A. 对
B. 错

Hemingway spoke highly of such _____ as loyalty, courage and determination known by human beings in his work.

A. features
B. appearances
C. virtues
D. characteristics

The trend of brain drain does the developing countries _____degrees of harm.

A. diver
B. diversify
C. diverse
D. diversity

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