单项选择题
A.0.3m,0.15m B.0.2m,0.15m C.0.3m,0.25m D.0.2m,0.25m
A.40% B.50% C.60% D.80%
A.线槽中间及接头处 B.距接线盒1/3m处 C.线槽转角或分支处 D.直线段不大于4m处