A.宜沿短边方向进行 B.可多点同时浇筑 C.宜从高处开始 D.应采用平板振捣器振捣
A.6% B.7% C.8% D.9%
A.50mmB.60mmC.70mmD.80mm
A.25% B.30% C.35% D.40%
A.印花税 B.工程排污费 C.工会经费 D.检验试验费