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本帖最后由 醉酒当歌 于 2014-4-20 23:48 编辑
! D8 r0 }, e* b& I3 e- W" mwlwlwlwl 发表于 2014-4-20 22:52 
7 V1 o! L% P' X, s+ J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? * J* U# Q i. p+ X- [
3 w0 R- C8 A* k" W' zA 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]9 Q' q6 t( w) x C" m& o- b# v' t9 k
5 r9 T' E2 f' o% Z全称是Polyhydroxyl Ketone or polyhydroxy aldehydes. 你说的分子式没错。5 b" Y W. h- J7 y. z7 _# S
X' |3 i) O# n3 }% ~8 }Carbonhydrates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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