Your dad and Admiral Spruance are rounding the Smiths'terrace.你爹跟期普鲁恩斯少将绕过坡上史密斯家的房屋来了.He had sought work as a cowboy, rounding up cattle.他找了一份放牛的差事，负责把牛赶到一起。After rounding Cape Finisterre the boats ride the north-ea...
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...