在1,2--二亚甲基环丁烷中并不发生这种现象.This phenomenon does not occur with 1 - 2 - dimethylenecyclobutane.环丁烷主要成 “ 蝶式 ” 构象存在.Cyclobutane exists predominantly in a " butterfly " conformation.四 号 溶剂主要成分为液化丁烷.The main component in 4 # solv...
成双的袜子是别在一起的.Pairs of socks are pinned together.她那旷世无双的美貌无法形容.Her matchless beauty is beyond description.这是为什么不能再卖这双的原因.That is why Normal rating as cannot resell this pair....