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...
Do you think our housing sales will turn around during this year?你认为今年我们的住宅销路会好转 吗 ?The bus had to back up and turn around.那辆公共汽车不得不先往后退,然后再掉头.She couldn't bear to turn around again.她不忍心再转回身去....