问题 单项选择题 A1型题

有关辐射防护仪器的描述不正确的是()。

A.表面污染检测仪用于检测工作人员的体表和衣物有无放射性污染

B.表面污染仪可检测α、β、γ等不同辐射类型射线

C.工作场所监测仪用于测量放射性工作场所射线的照射量

D.个人剂量监测仪用于测量个人接受外照射剂量

E.个人剂量监测仪有便携式、固定式两种

答案

参考答案:E

问答题

(一) 一组同学在做“用单摆测定重力加速度”的实验中,用正确的操作方法,测定了6组摆长L和周期T的对应值.为了求出当地的重力加速度g,4位同学提出了4种不同的处理方法:

A.从测定的6组对应值中任意选取1组,用公式g=

4π2
T2
求出g作为测量值.

B.先分别求出6个L值的平均值

.
L
 和6个T值的平均值
.
T
,再用公式g=4π2 
.
L
.
T
2
求出g作为测量值.

C.先分别用6组L.T的对应值,用公式g=4π2L/T2求出6个对应的g值,再求这6个的平均值作为测量值.

D.在坐标纸上作出T2-L图象,从图中计算出图线的斜率k,根据g=

π2
k
求出g作为测量值.

你认为以上4种方法中,错误的是哪一种______ (填代号即可),其余正确方法中,偶然误差最小的是______(填代号即可)

(二)某兴趣小组为测一遥控电动小车的额定功率,进行了如下实验:

①用天平测出电动小车的质量为0.4kg;

②将电动小车.纸带和打点计时器按如图甲所示安装;

③接通打点计时器(其打点时间间隔为0.02s);

④使电动小车以额定功率加速运动,达到最大速度一段时间后关闭小车电源,待小车静止时再关闭打点计时器(设小车在整个过程中所受的阻力恒定).

在上述过程中,打点计时器在纸带上所打的部分点迹如图乙所示.

请你分析纸带数据,回答下列问题:

①该电动小车运动的最大速度为______m/s;

②该电动小车的额定功率为______W.

阅读理解

阅读理解

     Writing a long book seemed to be too much for me.So, for a long time, I just wrote short articles.

One day, inspiration (灵感) for an article hit me and, as I started writing, paragraphs began flowing out

fast.It turned out to be too long to be an article.I thought it would not hurt to try selfpublishing a booklet (小册子). The first printing of this 32page black and white booklet sold out within a week.Here is

something that I have learned through my experience.

    1. Start small.

    Don't try to have a 400page work as your first publication (出版物). I suggest you publish a booklet

under 50 pages to launch your career as an author.

    2. Ask for advice.

    If you know some people who have published something, ask them for advice and help.You will gain

useful information from them and save yourself many problems.

   3. ____________________

    When you put your heart into something only to hear "We're not interested", you may get hurt.But you

must remind yourself that this is quite common.Every "yes" you receive comes after at least five "noes",

especially at the beginning.You need to revise (校订) your book many times to reduce the chances of

being turned down.

   4. The more you market, the more you sell.

    You can publish an excellent book.But if no people know about it, you cannot expect many buyers.

Send out an email to friends, family and business partners, telling them your book's publication date.Ask

them to help sell your book.Do not be afraid to try novel ideas.

1. We learn that before selfpublishing his first booklet, the writer most probably________.

A. hoped that he would write some famous long stories

B. had nothing published in newspapers

C. was not happy with what he had written

D. thought it difficult to finish a long book

2. What does the underlined word "launch" in Point 1 here mean?

A. Begin.  

B. Develop.  

C. Lead.  

D. Describe.

3. What's the best title for Point 3?

A. No one will like what you wrote at first.

B. You will get hurt by what you wrote at first.

C. Prepare for a "yes" rather than a "no".

D. Be prepared to deal with "noes"

4. According to the passage, if you want to have more copies of your book sold, you should________.

A. advertise your book in newspapers

B. try to make more people know your book

C. ask your business partners to buy your book

D. write something that people are interested in

5. About selfpublishing a book, the writer would most probably agree that________.

A. one usually makes no money out of selfpublishing a book

B. one should never selfpublish a book longer than 400 pages

C. selfpublishing a book is impossible for most people

D. asking advice from people who have published a book is helpful