【简答题】(8分)已知A的分子式为C 3 H 4 O 2 ,下图是A~H间相互转化的关系图,其中F中含有一个七元环;H是一种高分子化合物。(提示;羟基与双键碳原子相连的醇不稳定;同一个碳原子上连有2个或多个羟基的多元醇不稳定)。请回答下列问题: (1)A中含有的官能团名称: ; (2)请写出下列有机物的结构简式: C ; H [ (3)请指出下列反应的反应类型:B D ;G 丙二酸 (4)请写出D和E生成F...
【单选题】听力原文:M: Let's look at your problem: you always fail the job interviews. W: It seems so, sir. And the thing is that I always find those questions hard to answer. For example, they always ask me what I ...
【简答题】Getting away for a short time always seems like a great idea—until you have to pack. 小题1:The rule is: pack light. Here are some tips to help you pack. 1. Make a list. Think of what you need from your ...