【简答题】A.淀粉与纤维素分子中均含有葡萄糖单元,分子式为(C 6 H 10 O 5 ) n- 。从组成上看,淀粉和纤维素是聚合程度不同的物质的混合物 B.淀粉与纤维素都是天然高分子化合物,属于无还原性的多糖,最主要的性质之一是在无机酸溶液的作用下,都能水解成单糖 C.由于纤维素中碳的百分含量高于淀粉,所以纤维素常用来制造火棉 D.淀粉溶液和纤维素溶液都属于胶体,因分子直径大,都不能透过半透膜
【简答题】Which sentence is the topic sentence of this paragraph? Write it down. There are many reasons that I love to teach. First of all, I love to teach because I love being at school. Another reason I love ...
【简答题】Why shouldn't students take too many things to college with them? A) Because there isn't often much space in student accommodation. B) Because it might get stolen.C) Other students might think they ar...
【单选题】The idea of going overseas for university study is an exciting prospect for many people. But while it may offer some advantages, it is probably better to stay home because of the difficulties a studen...
C.
Living in a different culture.
D.
Advantages of studying abroad.
【多选题】国家7部委12号令《评标委员会和评标方法暂行规定》规定,投标偏差分为重大偏差和细微偏差。下列哪些情况属于重大偏差?()
A.
没有按照招标文件要求提供投标担保或者所提供的投标担保有瑕疵
C.
投标文件载明的招标项目完成期限超过招标文件规定的期限
【单选题】生物机体中蛋白质、核酸等这些巨大的分子称为生物大分子。他们的共同特点都是通过单体互相缩合、脱水形成线性的多聚体,即大分子。如动物肝脏和肌肉中的糖原(动物淀粉)大分子就是把葡萄糖单体以同样的糖苷键连接成的葡萄糖多聚体。核酸则是以( )为单体通过肽键连接的多聚体
【多选题】下列哪些情况一定属于重大偏差,应作废标处理。 ()
B.
未按招标文件设定的暂定材料价格进行报价或擅自变动暂定价
【单选题】His teacher was proud of him because he was a student of many_____.
【单选题】下列哪些情况不属于促使国际企业采取差异化营销组合的理由?