问题 单项选择题

关于X线防护原则,错误的是()

A.建立剂量限制体制

B.缩短受照时间

C.最简易的防护措施是距离防护

D.缩短焦物距

E.减少X线发射剂量

答案

参考答案:D

解析:X线的防护原则是建立质量限制体系,建立防止外照射的基本方法:缩短受照时间、增大与射线源的距离、建立屏蔽防护、固有防护为主,个人防护为辅、X线工作者与被检者防护兼顾、合理降低个人受照剂量与全民检查频率。对照此基本方法,D项叙述是错误的。

选择题
完形填空

第二节完形填空(共20小题;每小题1.5分,满分30分)

  阅读下面短文,从短文后各题所给的四个选项(A、B、C、D)中,选出可以填入空白处的最佳选项,并在答题卡上将该项涂黑。

  I was about six when I started doing gymnastice.I 36 going into the school's gymnasium full of equipment,with the other kids rushing in ,anxious to 37 ,and the scent in the air.

  I realized I wanted to get 38 with gymnastics when I watched the Olympics.When I saw those 39 use their bodies to gracefully throw 40 up in the air ,I was filled with admiration:It seemed that they could fly and I 41 myself flying like them.And when I finally tried,the 42 I got for that one 43 in the air was freedom,freedom from everything.It was a 44 ,and it was addicting.

  I was crazy when I was little.I was the boy parents didn't want their kids 45 for fear that they would 46 what I did and get hurt.Parents thought I was 47 because I would try tricks that others of my 48 wouldn't.Some of my coaches said kids as old as me don't have the courage and ability to achieve the tricks I could. What most people didn't 49 were the hours I put into learning those tricks.I practiced every step 50 until I put them together and my hard work would 51 something great.

  This hard work once stopped when I 52 ,and started at a new school.Everything there was 53 ,but the giggeset change was a lack of a gymnastics gym.

  Now I've restarted training in a team I can learn from.As a little kid I could only 54 wide-eyed as the gymnast flew high in the air. 55 I'm older,it's my time to fly.

  36.A.regret      B.remember      C.considered     D.avoided

  37.A.enter       B.leave         C.meet          D.learn

  38.A.serious     B.careful        C.busy          D.interested

  39.A.dancers     B.fans          C.athletes       D.winners

  40.A.others      B.themselves     C.everything     D.each other

  41.A.enjoyed     B.found         C.set           D.imagined

  42.A.feeling      B.lesson        C.courage       D.instruction

  43.A.second      B.effort         C.circle        D.stop

  44.A.bore        B.panic         C.high         D.trouble

  45.A.around      B.among        C.above        D.away from

  46.A.study       B.envy          C.notice        D.copy

  47.A.bad        B.crazy          C.excellent      D.dangerous

  48.A.place      B.age            C.time          D.size

  49.A.explain     B.understand     C.realize        D.experience

  50.A.now and then B.all theh time    C.over and over   D.little by little

  51.A.go through   B.belong to      C.turn into       D.give way to

  52.A.moved      B.changed       C.failed         D.finished

  53.A.all right     B.the same      C.terrible         D.different

  54.A.practice      B.watch       C.sigh            D.sit

  55.A.Simply because B.Even though  C.As soon as     D.Now that