A.硬聚氯乙烯 B.聚乙烯 C.聚丙烯 D.軟聚氯乙烯
A.酚醛樹(shù)脂 B.環(huán)氧樹(shù)脂 C.環(huán)氧酚醛 D.呋喃樹(shù)脂
A.45# B.65Mn C.60Si2Mn D.Cr13