covalent是什么意思？

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...

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]...

肉食甲...

v.醒来，睡醒( waken的第三人称单数 )，唤醒，弄醒，（使）觉醒， （使）振奋，激发...

“开罗”的拼音为：kāi luó...

thoughtful的反义词有：hardhearted, selfish, thoughtless, unfriendly, rash, unkind, cruel, heedless, indifferent, inconsiderate, rude, thoughtless, unthoughtful, careless。adj.thoughtful的反义词（深思的;细心的;体贴的）：hardhearted, selfish, th...

hep的音标：hep的英式发音音标为：[hep]hep的美式发音音标为：[hep]...

比重瓶比重计...

n.无用，无效，负效用...

In the star - studded sky, are there your distant reveries?在星星点缀的天空中, 有你遥远的遐想在里面 吗 ?You cannot refrain from fantastic reveries and are led into the mysterious and outlandish wonderland.情不自禁地遐想,误入神秘奇异的仙境....

n.海军准将，〈英〉分舰队司令官，[水运] 船队队长，游艇俱乐部会长...

gap的近义词/同义词有：blank, unfilled, space, pass, crevice, cleft, rift, break, opening, hole, gulf, vacancy, gape, daylight, rift, hole, crevice, blank, break, aperture, pass, valley, gulf, cleft, fissure, breach, opening。n.gap...

“杀人者”的英语可以翻译为：[医] homicide，manslayer，murderer ...

磺硫脲...

Portman的音标：...

The wounded soldier tottered to his feet.伤员摇摇晃晃地站了起来.The pile of books tottered then fell.这堆书晃了几下,然后就倒了.He tottered to the fridge, got a beer and slumped at the table...他踉跄地走到冰箱前，拿出一瓶啤酒，一屁股坐在桌边。Under the buddle tottered ...

So far 57 have taken the test and all have been negative.到目前为止，参加测试的有57人，测试结果均呈阴性。Stimulate the site of greatest pain with a small negative current.以微弱负电流刺激疼得最厉害的部位。The weakest students can end up with a negative score.最...