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问答题
For the circuit shown in Figure, the operational amplifier is assumed to be ideal, for the transistor VBE=VB-VE=0.7V, if the reading of the voltmeter is 200mV,then the current gain β of the transistor is ( )
For the circuit shown in Figure, the operational amplifier is assumed to be ideal, for the transistor VBE=VB-VE=0.7V, if the reading of the voltmeter is 200mV,then the current gain β of the transistor is ( )
答案：
50
