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【单选题】
如下图所示的电路中,设 E1=10V,R1=20 Ω ,E2=2V,R2=60 Ω , 用支路电流法求各支路电流为( )。A.
I1=0.2 A ， I2=0.1 A ， I3=0.3 A
B.
I1=0.2 A ， I2= - 0.1 A ， I3=0.1 A
C.
I1=0.3 A ， I2= - 0.2 A ， I3= - 0.1A
D.
I1= - 0.1A,I2= - 0.2A ， I3= - 0.1A
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