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【单选题】
某放大电路在负载开路时的输出电压为 6V ,接入 2 KΩ 的负载时输出电压为 4V ,该放大电路的输出电阻为 _________千欧。A.
10
B.
2
C.
1
D.
0.5
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A.
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B.
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