单项选择题
A.0.9~1.0 B.1.0~1.2 C.0.9~1.1 D.0.9~1.2
A.≥1米 B.≥2米 C.>2米 D.≥3米
A.6m至9m B.8m至10m C.6m至8m D.10m
A.1层B.2层C.3层D.4层
A.15B.18C.20D.25
A.底层第一步B.底层第二步C.顶层顶步D.上述都对
A.50mm B.100mm C.150mm D.200mm
A.1个B.2个C.3个D.看情况确定
A.2B.3C.4D.5
A.1.5 B.1.7 C.1.8 D.2.0
A.3 B.4 C.4.5 D.5