题目内容

运算电路中一般均引入负反馈。( )

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在运算电路中,集成运放的反相输入端均为虚地。( )

PN结在无光照、无外加电压时,结电流为零。( )

54

A. gathered
B. understood
C. learnt
D. gained

The high-speed trains can have a major impact on our lives.

A. effort
B. problem
C. influence
D. oncern

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