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已知甲、个 放大电路 的 开路输出电压 均 为 5V , 甲电路的 短路输出电流为 2mA , 路接 5.1k W 时输出电压 为 2.5V , 则可得 甲电路的 输出电阻为( ) ,路的 输出电阻为( ) 。
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