常見例句Only AC current above certain frequency can be measured accurately.只有高于某些頻率的交流電流才能被準確的測到。The rectifier lets current flow into the battery only when A.C. surges in the direction of the arrow.只有當交流電流沿箭頭方向急沖時，整流器才允許電流流入電池組。 返回 alternating-current