A.玻璃B.聚乙烯塑料C.沒(méi)有要求D.聚氯乙烯塑料
A.0.95~1.05B.0.90~1.10C.0.98~1.02D.0.85~1.15
A.As2O3 B.ZnO C.K2Cr2O7 D.Na2CO3