A.磷酸鹽 B.石英 C.二氧化硅 D.硬質(zhì)石膏 E.SiO2
A.0.5 B.0.25~0.35 C.1 D.0.22 E.0.75
A.75%~85% B.5%~8% C.4% D.10% E.1%