电气设备在进行耐压试验前,应先()。
A.放电
B.拆除并检查接地线
C.测定绝缘电阻
参考答案:C
(2014·江西南昌两校第四次联考)—Don’t worry.I had a license years ago.I’m not green.
—________!I’ll tell my daughter that everything is OK on the way.
A.What a relief
B.Congratulations
C.How surprising
D.I’m so sorry
肺动脉瓣狭窄最常见的病因是先天性。()