题目内容

某放大电路在负载开路时,测得输出电压为5V,在输入电压不变的情况下接入3KΩ的负载电阻,输出电压下降到3V,说明该放大电路的输出电阻为()

A. 5KΩ
B. 4KΩ
C. 2KΩ
D. 3KΩ

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