问题 单项选择题

某体育场设有照明设施和管理用房,其场地灯光布置采用四塔照明方式,其中灯塔位置如下图所示,灯塔距场地中心点水平距离为103m,场地照明灯具采用金属卤化物等,请回答下列问题。

体育场的某竞赛管理用房长12m、宽6m,吊顶高3.42m,经计算,室内顶棚有效空间反射比为0.7,墙面反射比为0.5,地面有效反射比为0.2,现均匀布置8盏2×36W、嵌入式格栅照明灯具,用T8直管荧光灯管配电子镇流器,T8直管荧光灯管36W,光通量为28501m,工作面高度为0.75,格栅灯具效率为0.725,其利用系数见表3(查表时RI取表中最接近值)维护系数为0.8,计算该房间的平均照度为下列哪项数值()。

A.367 lx

B.296 lx

C.309 lx

D.289 lx

答案

参考答案:C

解析:

[解答过程] 根据《照明设计手册》第2版P211。

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阅读理解

阅读理解。

     We need your name, year of birth, home address (city and state), phone number, school name and

e-mail address so that we can e-mail you if your work is published (出版).

     The sentence "I promise (承诺) that the work is original (原创的)" must be written on the top of

your writing, and then you must write down your name.

     Keep sending your works all winter! You can mail your works to Chester Press Box 172, Chester,

Cheshire, visit www. Chesterpress.edu or submit (注册) @Chesterpress. edu.

     Please remember the following points:

     ★ You should keep a copy for yourself.

     ★ Your work may be corrected. We keep the right ( 权利) to correct and publish it in any form

     without your permission.

     ★ If you don't want your name and address for our record, we will not return your work that you

     send to us

1. Which of the following is NOT mentioned in this passage?

A. Phone number.              

B. School name.

C. School address.                  

D. Year of birth.

2. From the passage, we know that Chester Press is probably a ______.

A. magazine

B. film

C. game

D. club

3. Which of the following is NOT true according to this passage?

A. You can send your works in winter.

B. Editors at Chester Press cannot correct your works.

C. You have to make sure that your works are original.

D. You will be told by e-mail if your work is published

4. What do we know from this passage?

A. You can send your works by post.

B. You must type the works yourselves.

C. You aren't allowed to keep your own copy.

D. Your works cannot be published without your permission.

5. Who might be interested in this passage?

A. Nurses.                

B. Book sellers.  

C. TV reporters.              

D. Writers.

单项选择题