A.15mm B.13.5mm C.12.5mm D.20mm
A.角深大于1m的角桿 B.仰角桿導(dǎo)線數(shù)超過8條的電桿 C.跨越桿 D.分線桿
A.100-200 B.200-300 C.300-400 D.400-500