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(四川大学2004年试题)如图4一69所示电路,N为线性含源电阻网络,IS1=1A、US2=1V,当开关S1、S2都打开时安培表的读数为1A;当S1闭合、S2打开时,安培表的读数为1.5A;当S1、S2都闭合时,安培表的读数为1A。试求当IS1=3A、US2=5V时,安培表的读数。
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