45°以上的转角杆应采用()。
A.双横担双绝缘子
B.单横担双绝缘子
C.十字横担
D.针式绝缘子
参考答案:C
You _____ of the time of the party, but I forgot. I am so sorry.
A.should have been told
B.ought to tell
C.could have told
D.ought to have told
决定触电伤害程度的因素有()
A、电流的种类
B、电流的大小
C、人的精神状态
D、电流流通路径