摘要：丁晴橡胶具有优良的耐油.耐高温性能.合成丁晴橡胶的原料是 ① CH2=CH-CH=CH2 ② CH3-CC-CH3 ③ CH2=CH-CN ④ CH3-CH=CH ⑤ CH3-CH=CH2 ⑥ CH3-CH=CH-CH3 CN A.③ ⑥ B.② ③ C.① ③ D.④ ⑤

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