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【单选题】
在图所示电路中 ,当K闭合后,电压表V 1 的示数为4伏,电压表V 2 的示数为6伏,电流表A的示数为1安,将 R 2 和 R 3 对换位置后,V 1 、V 2 和A的示数均不变,则A.
电阻 R 1 的阻值为4欧
B.
电阻 R 2 两端电压为3伏
C.
电源电压 U 为10伏
D.
通过电阻 R 1 、 R 2 、 R 3 的电流之和为1安
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A.
正确
B.
错误
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