题目内容

直接耦合放大器是直流放大器,只能放大直流信号,不能放大交流信号。( )

A. 对
B. 错

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______, ______, and ______ are some factors that lead parents to pursue a competitive approach to child rearing.

Many people now prefer the saying "early ripe, early rich" to the saying "early ripe, early rot."

用电单位的供电电压应根据用电容量、用电设备特性、供电距离、供电线路的回路数、当地公共电网现状及其发展规划等因素,经技术经济比较确定。( )

A. 对
B. 错

低通滤波器的截止频率fc是频响曲线中______点的频率,fc以上是______,fc以下是______。

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