A.1‰ B.2‰ C.3‰ D.4‰
A.0.2 B.0.3 C.0.4 D.0.5
A.砂的膨脹系數(shù) B.過(guò)篩損耗 C.配制各種砂漿、砼時(shí)的操作損耗 D.施工現(xiàn)場(chǎng)的篩砂用工