题目内容
(请给出正确答案)
[单选题]
对于盘扣式钢管模板支架,其可调托撑伸出顶层水平杆或双槽钢托梁的悬臂长度不得超过(),且丝杆外露长度不得超过()。
A.650mm,400mm
B.650mm,500mm
C.700mm,500mm
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A.650mm,400mm
B.650mm,500mm
C.700mm,500mm
A.300mm
B.350mm
C.600mm
D.650mm
A.200mm
B.250mm
C.300mm
D.350mm
A.40%
B.50%
C.70%
D.80%
A.55mm
B.65mm
C.75mm
D.85mm