下列有关工程塑料PBT（ ）的说法中，正确的是 A．PBT是加聚反应得到的高分子化合物
What have you got _____ will help a cold? A. what B. that C. it D. who
政治家的眼睛 球迷的眼睛 商人的眼睛 情人的眼睛 结合四种眼睛所表现的内容写一篇文章，自拟文题，体裁不限，不少于800字。
---Where will you start your work after graduation? ---Mmm, it's not been decided yet. I ____ continue my study for a higher degree. A. need B. must C. would
阅读（45分）阅读下面的两段文言文，回答问题。（甲）余幼时即嗜学。家贫，无从致书以观，每假借于藏书之家，手自笔录，计日以还。天大寒，砚冰
Have you ever hear a saying, “Never judge a book by its cover.”? This is a good rule to follow when trying to judge the intelligence of others. Some people have minds that shine only in certa
–What can I do for you, sir? -- I want to buy some this afternoon. A. Paper and pencil B. apples and banana C. milk and eggs
能说明葡萄糖是一种还原性糖的依据是( )A.与H2加成生成六元醇B.能发生银镜反应C.能与酸发生酯化反应D.能与新制Cu(OH)2悬浊液共热生成红色沉淀
在点
处连续，则
的值是 