 鲜花( 150)  鸡蛋( 3)
|
本帖最后由 醉酒当歌 于 2014-4-20 23:48 编辑 ; y/ a0 P% ]3 I
wlwlwlwl 发表于 2014-4-20 22:52 " d: T8 C, e! e( e4 w+ U
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? 1 h, `, N6 u1 m1 g: Q7 C
) J6 X; d4 A- _! N3 H
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]0 S4 H7 X5 x2 e7 Q6 g+ W
% X6 j" }: ^9 h* U8 v全称是Polyhydroxyl Ketone or polyhydroxy aldehydes. 你说的分子式没错。7 S) K( N) R8 M' z1 Z& A
& P8 Z( V _! S3 P( S8 S, sCarbonhydrates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。 |
|