Polystyrene - supported N - benzyl - N - alkyl - aminopyridine was prepared through chloromethylated polystyrene treated with 4 - aminopyridine and alkylation agents.本文以聚苯乙烯氯球为原料,通过与 4- 氨基吡啶及烷基化试剂反应,制成聚苯乙烯支载N - 烷基-N-苄基氨基...
It's a good chance to broach the subject.这是开始提出那个问题的好机会.Complete crystal shape, high diaphaneity and low impurity. Suitable for circular saws, frame saws and geological broach.晶体完整, 透明度高,杂质含量低,晶形与晶体强度性能优越. 使用于圆锯切片 、...
Alton has made himself fiercely unpopular in certain circles.奥尔顿把自己搞得在某些圈子里极其不受欢迎。Responsibility for the dance numbers was split between Robert Alton and the young George Balanchine.舞蹈节目分别由罗伯特·奥尔顿和年轻的乔治·巴兰钦负责。They nomina...
No detail was too small to escape her attention.再小的细节都逃不过她的眼睛。He was waving his arms to draw their attention.他正挥手以引起他们的注意。You may feel unworthy of the attention and help people offer you.你可能会觉得自己不值得别人关心和帮助。...
Running shoes have extra cushioning.跑鞋有额外的减震设计。The mattress and cushioning material used should be made of approved material.床垫和缓冲材料应采用经认可的材料.Configurations: after charge air, the former charge of rubber cushioning.配置: 后...
Jeff had shopped extravagantly for presents for the whole family.杰夫花了很多钱为全家人买礼物。Fraudsters are often shopped by honest friends and neighbours.诈骗犯经常会被正直守法的朋友和邻居告发。He shopped around for a firm that would be flexible.他到处寻觅一...
The gestation period can be anything between 95 and 150 days.妊娠期从95天至150天不等。a baby born at 38 weeks' gestation怀孕38周时出生的婴儿This film was two years in gestation.这部电影酝酿了两年....
We have, therefore , in both of the examples above, heterocyclic compounds with " built - in " or latent functionality.上述两例中的杂环化合物,都具有 “ 固有的 ” 或潜在的官能基.Morphine: Heterocyclic compound, narcotic analgesic alkaloid original...