基本解释无环烃词组短语短语acyclic c hydrocarbon 无环烃Acyclic aliphatic hydrocarbon 开链烷烃unsaturated acyclic hydrocarbon 不饱和无环烃;不饱和链烃saturated acyclic hydrocarbon [有化]饱和无环烃acyclic hydrocarbon更多词组专业释义经济学无环烃化学无环烃