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...
He precipitated himself from the housetop.他由屋顶跳下.She is sitting at the window, looking out over the housetop.她坐在窗户旁边, 看著外面的屋顶.I lie awake , I have become like a lonely bird on a housetop.诗102:7我警醒不睡.我像房顶上孤单的麻雀....
Many flattering relatives fawned on the rich old man.许多谄媚的亲戚都奉承那个老富翁.Jewellers were well - bred and flattering men, even at that day.甚至在那个时代,珠宝商们就已经是有教养,善于奉承人了.Right now , the maximum flattering swimsuits are not embelli...
In some stores we were undermanned and customer service was suffering.有些店我们人手不足，对顾客照顾不周。Banks spent his national service in the Royal Navy.班克斯在皇家海军服过兵役。In April 1944 he was killed on active service.1944年4月他在战时服役中阵亡。...
A robin was perching on the fence.一只知更鸟落在篱笆上。Perching can be discouraged by scaring, shooting or chemical repellants.轰吓 、 射杀或者用化学忌避剂可防止鸟类栖息.Perching on the periphery of every orchestra is a percussion player.坐在每支管弦乐队外围的是...