【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】Is the customer always right? The answer, it seems, depends on which country you are in. Shopping is very much a part of a country's culture, and attitudes to shopping and consumers vary from country ...
A.
retailers are under increasing pressure to improve their service and cater more for consumer demands
B.
America has been set as an example of good customer service
C.
they are aware that attitudes to shopping and consumers may vary in different countries
【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 ...