异亚丙基丙酮CH3COCH=C(CH3)2中n→π*跃迁谱带,在下述溶剂中测定时,(

题型:单项选择题

问题:

异亚丙基丙酮CH3COCH=C(CH32中n→π*跃迁谱带,在下述溶剂中测定时,()最大吸收波长最小。

A.正己烷

B.氯仿

C.甲醇

D.水

考点:材料科学材料研究方法材料研究方法题库
题型:单项选择题

阅读理解。

 Dear Sandy,

     How are you? It's Saturday today and I have some time to write to you. We're busy from Monday to

 Friday. We have to get up at six thirty in the morning. After some exercise we have breakfast. We have

 five classes a day and the first class begins at eight. Our teachers are strict and we can't be late for school.

  They often ask us a lot of questions and some of them are difficult.

     We do sports at five in the afternoon. We play basketball, soccer, volleyball, tennis or ping-pong.

 Some of my classmates like Art. They can sing or dance or draw. Sometimes Miss White, our Biology

 teacher, takes us to the zoo and we visit the animals there. At six we can leave our school.

     After supper we can watch TV. But we have to finish our homework first. I like Math and often do

 some difficult exercises. So I go to bed at ten thirty. I'm often tired but I like it.

     Please write to me and tell me about yourself.

                                                                                                                                    Yours,  

                                                                                                                                 Zhang Hong

1. Zhang Hong is very busy _____.

    A. from Monday to Friday                  

    B. on Saturday

    C. on Sunday                            

    D. on Wednesday

2. Zhang Hong can sleep for _____ hours a day

    A. six                    

    B. seven                

    C. eight                

    D. nine

3. Miss White teaches _____ in Zhang Hong's school.

    A. Biology        

    B. Math            

    C. Art              

    D. Music

4. The children have sports _____ .

    A. in the afternoon                          

    B. after school      

    C. in class                                      

    D. in the morning

5. Zhang Hong does some difficult Math exercises because _____ .

    A. her teacher makes her do so      

    B. she has much time at home

    C. she likes it                    

    D. her teachers are strict

题型:单项选择题

如果一次函数y=kx+b的图象经过第一象限,且与y轴负半轴相交,那么[ ]

A.k>0,b>0

B.k>0,b<0

C.k<0,b>0

D.k<0,b<0

题型:单项选择题

《经济适用住房管理办法》规定,购买经济适用住房不满()年,不得直接上市交易,购房人因特殊原因确需转让经济适用住房的,由政府按照原价格并考虑折旧和物价水平等因素进行回购。

A.1

B.3

C.5

D.10

题型:单项选择题

下列关于建设用地使用权出租的说法,错误的是()。

A.建设用地使用权出租期间,出租人的建设用地使用权消灭

B.通过转让方式取得的国有建设用地使用权可以出租

C.通过出让方式取得的国有建设用地使用权可以出租

D.国有建设用地使用权出租的主体是建设用地使用权人

题型:单项选择题

怎样理解和把握列宁新经济政策的基本内容及其实质?

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