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【单选题】
348.当负载等效电阻 R' 相对于 Ri 大得很多时,振荡器的这种状态为( )状态。A.
过电压
B.
欠电压
C.
过电流
D.
临界
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反馈参考答案：
举一反三
【单选题】听力原文：(A) Three people are on the plane. (B) The people are getting off the train. (C) The workers are out of stationery. (D) No one is wearing a hat.
A.
B.
C.
【单选题】听力原文：(A) People are going down the steps to the show. (B) All the people are in their uniforms. (C) There are many chairs arranged in rows. (D) The stairs lead to a bridge.
A.
B.
C.
【单选题】What does it mean by 'the most vulnerable people in the world'?
A.
The people are from the poor country and they do not have much status in America.
B.
The people are not rich and do not know much about the laws.
C.
The people are not good at English, thus easily cheated.
D.
The people are illiterate and poor.
【多选题】下列说法哪些是错误的()。
A.
放大电路中输出的电流和电压都是由有源元件提供的
B.
电路中各电量的交流成分是交流信号源提供的
C.
由于放大的对象是变化量，所以当输入信号为直流信号时，任何放大电路的输出都毫无变化
D.
只要是共射放大电路，输出电压的底部失真都是饱和失真
【单选题】听力原文：(A) The people are sitting on the steps. (B) Some people are walking down the steps. (C) The people are lying on the steps. (D) Some people are going up the steps.
A.
B.
C.
D.
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