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本帖最后由 醉酒当歌 于 2014-4-20 23:48 编辑 , Y) [% Z7 m! }, A" H
wlwlwlwl 发表于 2014-4-20 22:52 ' T2 H. y; G3 v7 u& f' M
我真是不知道你查的是哪本书。问你,ketone的分子式 RC(=O)R' 能写成 Cm(H2O)n 的形式么? + |3 y2 y' m Q+ C+ |7 y+ z; H3 ^) e$ z
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A carbohydrate is a large biological molecule, or macromolecule, consisting of carbon (C), hydrogen (H), and oxygen (O) atoms, usually with a hydrogen:oxygen atom ratio of 2:1 (as in water); in other words, with the empirical formula Cm(H2O)n (where m could be different from n).[1] Some exceptions exist; for example, deoxyribose, a sugar component of DNA,[2] has the empirical formula C5H10O4.[3] Carbohydrates are technically hydrates of carbon;[4] structurally it is more accurate to view them as polyhydroxy aldehydes and ketones.[5]4 h3 |1 K7 Y! J
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全称是Polyhydroxyl Ketone or polyhydroxy aldehydes. 你说的分子式没错。
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; x* ? u. w" I- QCarbonhydrates不是都能吃。你说的充分还是必要条件,本身就与你的逻辑命题相违背。 |
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