A.3% B.5% C.7% D.10%
A.1 B.2 C.3 D.4
A.先停電容器開關(guān),后拉開各出線開關(guān) B.先拉開各出線開關(guān),后停電容器開關(guān) C.只拉開各出線開關(guān) D.只停電容器開關(guān)