A.快速預(yù)熱 B.降溫過快 C.過度烤制 D.調(diào)和瓷粉的液體被污染 E.除氣不徹底
A.5% B.10% C.15% D.20% E.25%
A.5%~10% B.10%~15% C.15%~20% D.20%~25% E.30%