电路两端的交流电压为U=Umsin314t V,在t=0.005s时的值为10 V,则接在电路两端的电压表读数为A.10 V B.5V C.1.414V D.7.07V(看了简单的参考答案后,怎样求出Um,什么“有效值”,“瞬时值”,“最大值”,我完
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