【单选题】
电路中___定律指出：流入任意一节点的电流必定等于流出该节点的电流。
A. 欧姆
B. 基尔霍夫电流
C. 楞次
D. 基尔霍夫电压
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答案
B
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2___
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3___
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4___
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1___
A. About an hour.
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C. About half an hour.
D. More than one and a half hours.
