A.豎持質(zhì)量第一 B.堅(jiān)持以建筑產(chǎn)品為核心 C.堅(jiān)持以預(yù)防為主 D.堅(jiān)持質(zhì)量標(biāo)準(zhǔn)
A.初凝前 B.初凝后 C.終凝前 D.終凝后
A.1 B.2 C.3 D.4