摘要:丁腈橡胶 [ CH2-CH = CH-CH2-CH2-CH ] n 具有优良的性能.合 成丁橡胶的原料是( ) CN ① CH2 = CH-CH = CH2 ②CH3-C ≡ C-CH3 ③CH2 = CH-CN ④ CH3-CH = CH-CN ⑤ CH3-CH = CH2 ⑥ CH3-CH=CH-CH3 A.③⑥ B .②③ C. ①③ D. ④⑤

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