用支路电流法计算图示电路的各支路电流为（）。A:I1=1A，I2=1AB:I1=1A，I2= -1AC:I1= -1A，I2= -1AD:I1= -1A，I2=1A 答案: I1= -1A，I2=1A

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用支路电流法计算图示电路的各支路电流为（ ）。A:I1=1A，I2=1AB:I1=1A，I2= -1AC:I1= -1A，I2= -1AD:I1= -1A，I2=1A 答案: I1= -1A，I2=1A