单项选择题
A.450mm B.500mm C.550mm D.600mm
A.150mm B.200mm C.250mm D.300mm
A.900mm B.1200mm C.1500mm D.1800mm
A.模板支架搭设高度3m及以上 B.模板支架搭设高度5m及以上 C.集中线荷载18kN/m D.施工总荷载20kN/m2
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