A.熱固型丙烯酸樹(shù)脂B.環(huán)氧樹(shù)脂C.氨基醇酸樹(shù)脂D.聚氨酯樹(shù)脂
A.50B.60C.70D.80
A.鋼質(zhì)鐵芯B.鋼質(zhì)銅芯C.鋼質(zhì)鎂芯D.鋼質(zhì)鋁芯