验电应在装设接地线或（）处对各相分别进行。
A.合接地刀闸
B.分接地刀闸
C.合断路器
D.分断路器
参考答案：A
— Have you moved into the new house?
— Not yet. The rooms___. [ ]
A. are being painting
B. are painting
C. are painted
D. are being painted
如图，△ABC中，DE是AC的垂直平分线，AE=3cm，△ABD的周长为13cm，求△ABC的周长．
