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- double mesocyclic diamine 中环二胺
- A new type of mesocyclic diamine grafted chitosan was synthesized by the reaction of 3 hydroxyl 1,5 diaza cycloheptane with epoxy activated chitosan. 壳聚糖经环氧活化生成具有环氧活性基的壳聚糖醚后,与3-羟基-1,5-二氮杂环庚烷发生接枝反应,制备了一种新型中环二胺壳聚糖。
- A new type of azacrown ether crosslinked chitosan was synthesized by reaction of chitosan with dihydroxy mesocyclic diamine activated by epoxidation. 以壳聚糖为原料,与经环氧活化的双羟基中环二胺反应,制备了一种新型的氮杂冠醚交联壳聚糖。
- NMR techniques were used to investigate the stereo configuration and conformation of the hydroxyl mesocyclic diamines and their derivatives in aqueous solution. 利用二维核磁共振技术对一类新的含羟基中环二胺及其衍生物在水溶液中的构型和构象进行了较为详尽的研究。
- Keywords hydroxyl mesocyclic diamine;carboxylic acid derivative;phosphonic acid derivative;NMR;configuration; 羟基中环二胺;羧酸衍生物;磷酸衍生物;核磁共振;构象;
- He is working double tides to finish his essay. 他日夜苦干,赶写他的文章。
- I do not realize it is a double feature. 我原先不知道这是双片连映。
- Double agents live in a perpetual state of fear. 两面派永远过着提心吊胆的生活。
- I want a double room with a view. 我要一间能看到风景的双人房间。
- He was so fat that he had a double chin. 他胖得有双下巴了。
- The carpet is too thick to double up. 这地毯太厚没法折叠。
- Is the material single width or double width? 这幅料子是单幅的还是双幅的?
- Reserve double room June fourth to tenth inclusive. 预订双人房间,六月四日至十日,共六晚,望订妥复电。
- In this case, I can double for penalty. 假如这样的话,我可以叫加倍了。
- Can you tell me the rate for a double room, please? 请告诉我一间双人房的费用可以吗?
- The soldiers came at the double. 士兵们是急行军来的。
- A couch performs a double service. 躺椅有双重的服务。
- Look, double yellow lines you mustn't park here. 喂,这是双黄线--不能在这儿停车。
- Please double up the chair and put it aside. 请把椅子折起来放在一边。
- For strong sewing use double, not single thread. 为了缝得牢,用双线,而不要用单线。