任选的是, 可用加氢催化剂将纯化的二聚异丁烯加氢生成异辛烷.Optionally, the purified diisobutylene may be hydrogenated to isooctane hydrogenation catalyst.应用正碳离子聚合的方法合成新型聚异丁烯遥爪预聚物.The new telechelic prepolymers of polyisobutylene have been synthesize...
这是一种适于做女服用的织法精美的布料.This is a fine fabric for ladies'dresses.朵拉和玛丽提议采用一种新织法.Dora and Mary moved to adopt a new method of knitting.这件夹克是由织法精妙的鲜红色布料做的.The jacket is of scarlet cloth of a very fine weave....