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Which of the following is not a commonly used semiconductor material'？（）
Which of the following is not a commonly used semiconductor material'？（）
A.carbon
B.lead
C.silicon
D.germanium
正确答案：lead
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测得某放大电路的输入正弦电压和电流的峰值分别为10mV和10μA，在负载电阻为2KΩ时，测得输出正弦电压信号的峰值为2V。试计算该放大电路的电流放大倍数（）
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The characteristic of an ideal diode are those of a switch that can conduct current（）；.