Contents of trace hydrocarbons in propylene have large influences on polyreaction of propylene, yield of catalyst, transformation ratio of propylene and degree of isotacticity of products.是什么意思_Contents of trace hydrocarbons in propylene have large influences on polyreaction of propylene, yield of catalyst, transformation ratio of propylene and degree of isotacticity of products.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句