单项选择题
A.0.5mm2 B.0.75 mm2 C.1 mm2 D.1.5 mm2
A.4.0~4.5m B.3.0~3.5m C.2.0~2.5m D.1.0~1.5m
A.0≥30° B.0≥45° C.0≥60° D.0≥90°