问答题

3.
葡萄糖的醛基除了可以与C5上的羟基缩合形成六元环外，还可与C4上的羟基缩合形成五元环。五元环化合物不甚稳定，天然糖多以六元环的形式存在。五元环化合物可以看成是呋喃的衍生物，叫呋喃糖；六元环化合物可以看成是吡喃的衍生物，叫吡喃糖。因此，葡萄糖的全名应为α-D(+)-或β-D(+)-吡喃葡萄糖。

答案： aaa

你可能感兴趣的试题

Read the following paragraphs and complete them with the correct tense of the given verbs.
There [填空1](be) now a substantial body of work indicating that many would be willing to try GM products (Townsend and Campbell, 2004). These findings [填空2](be) consistent with data from the 2006 Eurobarometer report. Although "strong opposition" to the overall concept of GM foods technology [填空3](be) reported, when Eurobarometer respondents [填空4](be) asked whether they would buy GM foods "if it contained fewer pesticide residues than other foods", 51% [填空5](indicate)"yes, definitely" or "yes, probably".

答案：第1空:is 第2空:are 第3空:was 第4空:were 第5空:indicated

单项选择题

力的三要素是大小方向作用点所以它是矢量。
A、正确
B、错误