The music ______ she is dancing sounds b 发布时间:2017-05-19 15:27 │ 来源:www.tikuol.com 题型:选择题 问题: The music ______ she is dancing sounds beautiful.A.by whichB.to whichC.with whichD.at which
题型:选择题 某同学自制变压器,在做副线圈时,将外表涂有绝缘层的导线对折后并在一起在铁芯绕n2圈,导线的两个端头为a、b,从导线对折的中点引出了一个c接头,连线成如图所示的电路(线圈电阻不计).已知原线圈匝数为n1,原线圈的输入电压为u1=U0sint,则下列结论正确的是( )A.K打到b时,V表读数为n2U0/n1B.K打到b时,R中电流为零C.K打到c时,V表读数为n2U0/n1D.K打到c时,R的电功率为n22U20/(2n21R) 查看答案