单项选择题
盘扣式可调托撑丝杆外露长度不应超过(),可调托撑插入立杆或双槽托梁长度不得小于()。
A.200mm,200mm
B.300mm,150mm
C.400mm,150mm
D.400mm,200mm
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单项选择题
A.200mm,200mm
B.300mm,150mm
C.400mm,150mm
D.400mm,200mm
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