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本帖最后由 醉酒当歌 于 2014-4-20 23:48 编辑 , t1 e' y/ Q, ~0 _* X
wlwlwlwl 发表于 2014-4-20 22:52 
$ g; N- ~, A' I; ~. {; 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? " P& ]" }4 X& i8 x6 u" I
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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]( p* z8 v0 \! L# O& i
d+ e7 c6 @) j$ F* b" y4 R: I全称是Polyhydroxyl Ketone or polyhydroxy aldehydes. 你说的分子式没错。
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' B3 _/ z3 d+ k& a7 `- N* UCarbonhydrates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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