A.熟石膏粉與水調(diào)和的比例 B.攪拌時(shí)間 C.攪拌時(shí)的室溫 D.熟石膏的性能 E.以上均不是
A.10~19ml∶100g B.20~30ml∶100g C.31~39ml∶100g D.40~50ml∶100g E.51~60ml∶100g
A.1~1/2 B.1/2~1/3 C.1/3~1/4 D.1/4~1/5 E.1/5~1/6