A.加水 B.二次攪拌 C.二次配合比設(shè)計(jì) D.振搗
A.1:2.3:4.4 B.1:2.33:4.41 C.1:2.35:4.43 D.1:2.37:4.44
A.1 B.2 C.3 D.4