双键是共价键的一种，共价键，就意味着共用电子对的存在。简单的说，就是这一对电子，由键的两方各出一个，彼此共用。因此，一个共价键就可以填补一个最外层电子的空额。
双键 [shuāng jiàn]
网络释义专业释义
... 双键 复分解 闭环反应 苯并吡喃 氨基酸 肽 内酰胺 磺酰胺 磷杂环化合物 [gap=475]Keywords】: ORGANIC SYNTHESIS,DOUBLE BONDS,DOUBLE DECOMPOSITION,RING CLOSURE REACTION,BENZOPYRAN,AMINO ACID,PEPTIDE,LACTAM...
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... double decomposition 复分解 double linkage 双键 double refraction 双折射 ...
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... double kernel cake 双仁香酥 double key 双键 double knife noodle pressing mac你好ne 双刃压面条机 ...
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双语例句原声例句
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我们来考虑一下如何划分单键、双键和三键。
Let's think about how we can classify single and double and triple bonds,.
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实际上，你不能转动一个双键，它使得你的分子很坚固。
So really, you can not ever rotate a double bond, it makes your molecule very rigid.
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脂肪酸被生物体转化成包含碳氧双键即羰基的醛。
The fatty acids are then converted by the organisms to an aldehyde that includes a carbon atom bonded to an oxygen atom (together they create what's called a carbonyl group).
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So if we look at its length, it's actually shorter than a single bond, but longer than a double bond.
因此如果我们看它的键长的话，它实际上比单键更短，却比双键更长。
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And we find the same thing for these two atoms here, it's not actually a double bond, it's somewhere between a single bond and a double bond.
而且我们发现这两个原子的情况是一样的，它其实不是一个双键，而是介于单键与双键之间的。
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And something that we'll see later on is that triple bonds, for example, are going to be stronger than a corresponding double bond or a corresponding single bond.
而我们以后还会看到三键，举例来说，应该更强，相较于相应的双键,或者相应的单键来说。
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$firstVoiceSent
- 来自原声例句