乙-丙烯共聚物所合成的人造橡胶所占的重量还不到由5-亚甲基-2-降莰烷和/或5-乙烷基-2-降莰烷所形成的聚合物总重的5%.
注：norbornene的翻译可能不精确.
英语翻译Ethylene-propylene copolymer elastomers which may contai
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