A.聚氨脂涂層比環(huán)氧樹脂適應(yīng)性廣 B.聚氨脂涂層比較細(xì)潔光滑 C.聚氨脂涂層質(zhì)堅固 D.聚氨脂涂質(zhì)遇到溶劑也會軟化
A.酸類 B.烴類 C.醇 D.芳香溶劑類
A.CCL4 B.HCL C.NaOH D.C6H5OH