A.過(guò)氯乙烯樹(shù)脂 B.硝酸纖維酯 C.高麗樹(shù)脂 D.聚酷胺樹(shù)脂
A.蟲(chóng)膠、氯化橡膠 B.松香、石灰松香 C.蟲(chóng)膠、瀝青 D.動(dòng)物膠、甘油松香
A.54% B.69.4% C.70.4% D.84%