A.民用建筑單向樓板60mm B.工業(yè)建筑單向樓板60mm C.雙向板80mm D.無梁樓板150mm
A.3% B.6% C.9% D.12%
A.一級不宜大于200mm B.二級不宜大于250mm C.三級不宜大于280mm D.四級不宜大于300mm