下列说法正确的是() A.α粒子散射实验的结果证明原子核是由质子和中子构成 B.

题型:选择题

问题:

下列说法正确的是(  )

A.α粒子散射实验的结果证明原子核是由质子和中子构成

B.比结合能越大,原子核中核子结合得越牢固,原子核越稳定

C.波尔理论认为:氢原子核外电子轨道能量变化是不连续的,存在着能级

D.核力是短程力,只存在质子和质子之间

考点:原子核的组成
题型:选择题

阅读理解。

     Here are simple tips for getting to sleep. Not every one of these tips alone will get you to sleep, but a

 few of them at least should be successful. Listen to light music. Play some soft,  soothing music (令人舒

 畅的音乐) that will help you sleep. Of course you have a recorder or CD player that it automatically (自

 动地) turn off because if you get up and turn it off at the end, you'll lose its effect (影响).

    Drink warm milk. Drink a glass of warm milk 15 minutes before going to bed. It will keep you calm.

    Keep regular bedtime hours. Your body likes regular routines (带规) , whether you do or not. It likes to

 know that it's going to get up at the same time each day, eat at the same time, and go to bed at the same

 time. Avoid caffeine, alcohol and tobacco. Before you go to sleep, you'd better not drink coffee which

 contains coffee. Don't drink wine, beer or champagne (香槟酒) which contain alcohol and don't smoke.

    Don't watch TV or read before going to bed. Wait at least half an hour before going to bed after reading

  or watching television.

1. The passage is mainly about _____.

    A. how to get to sleep                    

    B. how to listen light music

    C. how to drink warm milk                

    D. how to keep regular bedtime hours

2. The word "tips " in this passage means _____.

    A. money to the waiter for his personal services          

    B. dirty places

    C. pieces of advice on how to do something            

    D. some medicine

3. If you choose the method of listening to music the writer advises us _____.

    A. not to listen to light music  

    B. to have a recorder or CD player that it automatically turn off

    C. to listen to rock music

    D. not to make the recorder or CD player lose its effect

4. After watching TV, you must wait before going to bed.

    A. ten minutes                  

    B. at least twenty minutes

    C. fifteen minutes              

    D. at least thirty minutes

5 Which of following is NOT mentioned (提到) in this passage?

    A. Go to the party.                

    B. Don't smoke.

    C. Drink wine or beer.            

    D. Drink warm milk.

题型:选择题

(12分)

材料一 我国城乡居民人均可支配收入增长比较

时间城镇居民农村居民国内生产总值
可支配收入(元)增长率可支配收入

(元)

增长率总值(亿元)增长率
2011218108.4%6997711.4%4715649.2%
2012184279.8%677812.3%3534807.7%
注:2012年前三季度我国国内消费对经济增长的贡献率超过投资和外需,将成为拉动经济增长的主引擎。

材料二 党的十八大报告提出,到2020年,实现国内生产总值和城乡居民人均收入比2010年翻一番,首次明确提出居民收入倍增目标。

(1)分析材料一反映的经济现象以及内在联系。(6分)

(2)结合材料一、二,阐述中央强调增加居民收入的依据。(6分)

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水泵机组全部机组联合运行时间一般为( )。

A.24小时

B.12小时

C.6小时

D.48小时

题型:选择题

吸脂术最为严重的并发症为()。

A、水肿

B、感染

C、血肿

D、脂肪栓塞

E、空气栓塞

题型:选择题

简述烟囱冒浓烟(干吸问题)的原因分析及处理方法

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