【单选题】某电源变压器的输入电压为220V,输出电压为15V,额定功率为30W,则变压器的额定输出电流为( )。
【单选题】—Can I tell Peter about the news? —No, I don't want anyone else to know it. You keep it to yourself. [ ]
【判断题】若变压器的输入电压为额定值,而频率低于额定值,那么在此种情况下,变压器的空载电流也会减少。
【多选题】根据有无预定的目的、任务,可以把记忆分为
【简答题】某变压器的输入电压为220V,输出电压为36V,原绕组825匝,现接一只36V,100W 灯泡,求:(1) 副绕组匝数? ( 2)灯泡中流过的电流?
【简答题】一号线地铁列车司机室送风单元变压器的输入电压为220V,可输出三个电压,分别为()。
【单选题】Don't tell anybody about the news. Keep it___you and me.
【简答题】-- Can I tell Peter about the news ? -- No , I don't want anyone else to know it . You keep it to yourself .( )A. must B. need C. can D. may
【单选题】You must keep the news a secret and don't put it _____ anybody else. [ ]
【单选题】Don't keep the news _yourself ,let's all shere it.