介绍了丙二酰氧基硼氢化钾的制备及其原位与烯烃的选择性硼氢化.The preparation of potassium malonyloxyborohydride in situ and its selective hydroboration alkene are described.叙述了丙二酰氧基硼氢化钠的制备及其原位与烯烃的选择性硼氢化反应.The preparation of sodium malonyloxyborohydrid...
She looked up some friends of bygone years.她去看望了一些过去的老朋友。The room had the elegance of a bygone era.这个房间有着旧时代的优雅.The ferry service of bygone days has been replaced by that tunnel.往日的渡口已被那个隧道取代....
The lower dislocation density in bainite is unfavourable for the aggregation and coarsening of carbides.贝氏体中位错密度较低,不利于合金碳化物的聚集粗化.Features and classification of bainite transition was described in detail.摘要详细介绍了贝氏体相变的特征及其...