把一个交变电流 i ,和一个直流 I 分别通过电阻值相同的电阻 R ,在相同的时间内,如果它们在电阻上产生的热效应相当,则该直流电 I 的值为对应交流电 i 的 ________ 。
A.
瞬时值
B.
最大值
C.
平均值
D.
有效值
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