单项选择题
A.通知 B.通告 C.公告 D.通报
A.≥300mm B.200~300mm C.100~200mm D.50~100mm
A.屋架 B.吊车梁 C.连系梁 D.纵向支撑
A.50mm B.60mm C.100mm D.150m
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