单项选择题
A.3 B.4 C.5 D.6
A.民用建筑单向楼板60mm B.工业建筑单向楼板60mm C.双向板80mm D.无梁楼板150mm
A.3% B.6% C.9% D.12%
A.一级不宜大于200mm B.二级不宜大于250mm C.三级不宜大于280mm D.四级不宜大于300mm
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