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本帖最后由 醉酒当歌 于 2014-4-20 23:48 编辑 3 \: J2 X$ u1 L/ q, ]
wlwlwlwl 发表于 2014-4-20 22:52 7 P0 Y/ n$ |& n8 o4 C) k
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? ! l* i. L2 U$ p6 H" P# i, ]
. L/ T" x" R% ?# ^. B8 N. jA 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]
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全称是Polyhydroxyl Ketone or polyhydroxy aldehydes. 你说的分子式没错。0 V$ W1 w: f( E
5 `) \# v c4 }$ B, X, oCarbonhydrates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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