第六章Your classmates and your roommates who are at the same age with you are right
答案:对
It is common for freshmen to feel miserable ,then who can they talk with?A valuable book is just like the best friend.
答案:对
All books are valuable, so we should do more reading in your spare time.--- Dad, when will you be free? You agreed to go to the seaside with me four days ago.--- I’m sorry, Jean. But I think I will have a _______holiday soon.This story happened on __________.________hat is this? It’s________.Look! The children are having __good time.a.A demonstration in our computer programming class will be given by Professor Smith at 1:30 p.m. on Thursday, December 21, in Room 1207 in Classroom Building No.1. b. All other students and teachers of our college are welcome to attend. c.All students and teachers of the Computer Department are expected to be present. Question: What is the correct order of the sentences given above?A nation will _____ only when its young people _____.核磁共振波谱中对比OCH3、CCH3和NCH3三个基团，NCH3的质子化学位移最大。苯环和双键氢质子的共振频率出现在低场是由于π电子的磁各向异性效应。
答案:对
在核磁共振波谱分析中，当质子核外的电子云密度增加时（ ）。
屏蔽效应增强，相对化学位移大，峰在高场出现
屏蔽效应增强，相对化学位移小，峰在高场出现
屏蔽效应增强，相对化学位移大，峰在低场出现核磁共振波谱中出现的多重峰是由于邻近核的核自旋相互作用。
答案:对
化合物CI2C H—CH2CI的核磁共振波谱中，H的精细结构为三重峰
答案:对
下列化合物中，在核磁共振波谱中，出现单峰的是（）。
CH3CH2Cl
CH3CH3
CH3CH(CH3)2
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