A.電場能正在向磁場能轉(zhuǎn)化 B.磁場能正在向電場能轉(zhuǎn)化 C.電場能向磁場能轉(zhuǎn)化剛好完畢
A.通直流阻交流 B.通交通阻直流 C.通低頻阻高頻
A.2倍 B.4倍 C.8倍 D.16倍