单项选择题
A.安全员检查 B.施工人员验收 C.先试用 D.技术鉴定
A.2m B.2.5m C.3m D.3.5m
A.4mB.5mC.6mD.8m
A.50×4 B.50×5 C.60×6 D.70×6
A.30°~40° B.35°~45° C.35°~50° D.40°~60°
A.60°±5° B.65°±5° C.70°±5° D.75°±5°
A.1000N B.1100N C.1200N D.1300N
A.14cm B.16cm C.18cm D.20cm
A.800N B.900N C.1000N D.1100N
A.40~60cm B.45~65cm C.50~70cm D.55~75cm
A.1m B.1.2m C.1.3m D.1.5m