题干

某脂肪酸的两种异构体结构简式如图所示

下列叙述错误的是                                                                                                 (   )

A:该脂肪酸含有羧基和碳碳双键两种官能团

B:(1)式为顺式结构,(2)式为反式结构

C:该脂肪酸最简单的同系物是CH2=CH-COOH

D:(1)和(2)分别与氢气加成,所得产物不同

上一题 下一题 0.0难度 选择题 更新时间:2020-01-11 12:45:24

答案(点此获取答案解析)

D

同类题3

阅读下面四篇短文,从每题所给的A、B、C、D四个选项中选出最佳选项。

A

     “USA? Britain? Which country is better to study in?” We often hear such discussions. As China opens its door, it is a dream for many Chinese students to study abroad. They want to learn about the outside world.

      It's true that studying abroad can help students develop themselves. Their foreign language skills will be improved and it may be easier to find jobs.

     But there are problems that should be considered. Language is the first. Students must spend a lot of time learning another language.

     Students must also learn to live without parents' care and do with all kinds of things they haven't had to do before, like looking after themselves. There are reports about Chinese students abroad sinking into an ocean of difficulties and giving up finally. When they have to take care of themselves, it is hard for students to study well.

      Finally, studying abroad brings a heavy burden to the family. For most Chinese parents, the cost of studying abroad is very high. But is it worth?

     We know that there are many famous people who succeed in great things through their hard work in China. Liu Xiang is a good example. Once an American teacher invited him there, but he refused. He kept training hard with his Chinese coach. He surprised the world when he won a gold medal at the Athens Olympic Games. So when you wonder which country is better to study in, think again.