500kV变压器应分别在油泵全部停止和全部开启时进行局部放电试验
参考答案:对
One thousand dollars a month is not a fortune but would help cover my living __________.
A.bills
B.expenses
C.prices
D.charges
I met the teacher in the street yesterday ________ taught me English three years ago.
A.which
B.when
C.where
D.who