某电熨斗内有R1、R2两段发热丝,其简化电路如图,它在220V或110V电压下都能正常工作:110V时将S打至1挡,220V时将S打至2挡,这两种情况下熨斗的电功率均为1100W.求
If you have any trouble, you can call me for help at any time.
在印度,小明沿途看到的当地妇女以( )服饰为主。
Danny, what do you usually do ________ school nights?