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【单选题】
基尔霍夫定律 ( Σ i = 0 和 Σ u = 0 )可以适用的电路类型为( )A.
只适用于直流电路；
B.
只适用于正弦交流电路；
C.
只适用于动态电路；
D.
可适用于任何电路。
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