covalent是什么意思？

covalent的音标：covalent的英式发音音标为：[ˌkəʊ'veɪlənt]covalent的美式发音音标为：[ˌkoʊ'veɪlənt]...

In covalent bonding, atoms share electrons.在共价键联中, 原子共有电子.Crystals may be classified as either ionic or covalent by analogy with molecules.与分子的情况一样,晶体也可以分为离子键型和共价键型.Ceramics primarily have ionic bonds, but covalent bondi...

Halogen bond is known as a kind of non - covalent intermolecular interaction.卤键是一种类似氢键的分子间弱相互作用.Chemical bond mainly includes electrovalent bonds , covalent bonds, and metalic bonds.化学键主要有离子键 、 共价键 、 金属键.Additionally, co...

Four cuckoos inside the zoo.动物园里四只杜鹃.Baby cuckoos oust other baby birds from their nests.布谷鸟的雏鸟把其他鸟的雏鸟逐出巢外.Let there be cuckoos, a lark and a dove.让这里有布谷鸟, 云雀,和鸽子....nestling cuckoos.小布谷鸟们...

She's got a great voice and is singing better than ever.她的嗓音非常好，现在的唱功比以往任何时候都要好。Workplace canteens are offering healthier foods than ever before.单位餐厅以前从没供应过像现在这样健康的饭菜。In terms of quantity, production grew faster tha...

constructed的音标：...

chalkboard的复数形式为：chalkboards...

The recipient has a valid digital ID for encrypting e - mail messages .收件人有 加密电子邮件 的有效数字标识.For foreign holidays you will need a valid passport.出国度假需持有效护照。The coupon is not valid if detached.这折扣券撕下即无效。Research results sho...

里诺（美国有名的“离婚城市”，在内华达州西部，凡欲离婚者，只须在该市住满三个月，即可离婚）...

vt.权力分散，人口疏散，密度分散vi.地方分权，疏散...

好吧，关于生产商就讲这么多，那关于消费者呢？Well, so much for the producers. But what of the con-sumers?我从他那里学到了许多关于经营乐队方面的东西.I learned a lot from him about how to run a band.关于我们的出版目的存在着某些误解。There has been some misunder-standing of our publi...

vi.采集植物，采集药草...

Typical framed structures are beams, grids, plane and space frames or trusses.典型构架结构为梁 、 格栅 、 平面的和空间的框架或桁架.Such trusses are called simple trusses.这样的桁架称为简单桁架.The truss comprises four plane trusses each two panels and eac...

marketeers的音标：...

I have a friend who has the opposing view and felt that the war was immoral...我有一位朋友的看法截然不同，他认为这场战争是不道德的。It is my belief that nuclear weapons are immoral.我相信使核武器是不邪恶的。She was questioned about his immoral conduct toward h...

n.格子，非实质的，地图上的坐标方格，（输电线路、天然气管道等的）系统网络...

文章确立了简便的一步法纯化盐生隐杆藻藻蓝蛋白.A single step chromatographic method for purification of - phycocyanin - PC was set up in this paper.利用Plackett-Burman设计筛选出影响盐生盐杆菌( Halobacteriumhalobium )B培养条件的重要因素,然后利用正交试验设计对这些重要因素加以优化.The impor...

She did not attempt to throw any suspicion upon you.她无意让大家怀疑你。The long-threatened storm was upon us...酝酿多时的暴风雨就要向我们袭来。They have no means, short of civil war, to enforce their will upon the minorities.他们只有通过内战才能将意志强加给少数派。...