题目内容

电压或电流同时叠加在信号的正负两端所产生的信号为共模信号，这种信号一般表现为噪声，抑制这种噪声可以采用差分放大器，这是因为差分放大器对共模信号（）。

A. 起衰减作用
B. 稍微放大
C. 没有放大
D. 缓冲作用

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差分放大器的输入阻抗越低，其对共模信号的抑制能力就越强。

A. 对
B. 错

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I admire Oprah because she seems to be “just a regular girl.”

Role models can also influence how much confidenceyou have in your ability to succeed.