A:①②
B:②③
C:③④
D:①④
矩形线圈在匀强磁场中匀速转动,所产生的交变电流的波形如图所示,下列说法中正确的是( )
1391=1()
脑____ 捧____ 扑____
恼____ 棒____ 朴____
—Lily, Your task is _______ when the train will leave.
—Ok, I'll do it right away.