In the reaction of acetylation and nitration 1,2 ? dichloroethane was used as solvent.在乙酰化、硝化反应中引入了1,2-二氯乙烷溶剂.Dichloroethane can be converted to VCM.二氯乙烷被转化为氯乙烯.Objective : To investigate the CT and MRI features of Subac...
茎状中柱的髓显得颇强健,像厚角组织.The pith of this stemlike stele appears rather strongly like collenchyma tissue.围绕中柱的是中柱鞘.Surrounding the central cylinder is the pericycle.中柱包括从原形成层衍生而来的全部初生组织,由中柱鞘 、 韧质部和木质部组成.The stele includes all p...
Two historical questions — you can answer them how you like.两个历史问题——你可以随便回答。We shall first look briefly at the historical antecedents of this theory.我们首先应大致看一下该理论在历史上的前身。The reputation of the navigator is under assault f...
All the doors have been bricked up to deter vandals.所有的门都用砖堵了起来，防止破坏分子闯入。The seat - covers on the train had been ripped by vandals.火车上的座位套子被破坏公物者故意撕破.The windows are covered with grilles to deter vandals.窗戶都安上了铁柵栏,以防止故意破...
We're always on the lookout for good computer programmers.我们一直在物色优秀的计算机程序编制员.Demand for topquality programmers exceeds supply, leading to extortionate salaries.对优秀程序员的需求远远超过了供给, 致使工资畸高.Computer programmers must lear...