问题 单项选择题

对实际应用问题建立了数学模型后,一般还需要对该模型进行检验。通过检验,尽可能找出模型中的问题,以利于改进模型,有时还可能会否定该模型。检验模型的做法有多种,但一般不会______。

A.利用实际案例数据对模型进行检验
B.进行逻辑检验,分析该模型是否会出现矛盾
C.用计算机模拟实际问题来检验模型
D.检验该模型所采用的技术能否被企业负责人理解

答案

参考答案:D

解析:针对实际问题建立的数学模型往往是近似的,往往忽略了许多复杂因素。这种模型能否解决实际问题还需要检验。检验的方法有多种。
利用实际案例数据对模型进行检验是很常见的。将模型作为一个黑盒,通过案例数据的输入,检查其输出是否合理。这是应用人员常用的方法。
有时可以请专家来分析模型是否合理。经验丰富的专家一般会根据模型自身的逻辑,再结合实际情况,分析是否会出现矛盾或问题。
有时很难用实际案例或聘请专家来检验模型,例如,试验或实验的代价太大,难以取得实际案例,有的项目技术比较新,缺乏有经验的专家。这时,如果能利用计算机来模拟实际问题,再在计算机上检验该数学模型,这往往是一种有效的办法。例如,对某种核辐射防护建立的数学模型,采用计算机模拟方法来检验就十分有效。
企业负责人需要提供一切必要的支持来解决实际问题。至于解决过程中采用的技术问题,则需要由技术人员研究决定。企业负责人只需要听取汇报,从宏观上认可就可以,不需要理解其中的技术细节。

填空题
阅读理解

阅读理解

     Social Program: 22nd-26th August 2011

     Monday Evening-Study Centre or Sports Park

     Study Center: The school will be open from 7.45 pm to 9.35pm.

     Sports Park: Aerobics, Swimming or Fitness Training (with a Fitness Card).

     Tuesday Evening-Cinema

     Cinema: To get your free ticket, you must write down which film you would like to watch. See the

leaflet on the board for this evening's UCI Cinema program. For more information about the films, visit

the UCI website www.uci.co.uk or see the film section in this week's Time Out magazine.

     Wednesday Evening-Study Centre of Tennis Coaching

     Study Center: The school will be open from 7.35 pm to 9.35 pm.

     Tennis Coaching: With former Junior Wimbledon tennis player Stuart Silvester.

     Thursday Evening-Chinese Party

     Chinese Party: Come along and enjoy the hospitality of the Chinese students! You can try delicious

Chinese food and learn about Chinese traditions. Please note that you should eat your evening meal at

your home-stay, as the food is a taster and not a full meal. Non alcoholic and alcoholic drinks will be

served.

     Friday afternoon-Historical Walking Tour or Sports Parks

     Historical Walking Tour: This afternoon you will have the opportunity to visit parts of Norwich you

may have otherwise missed, with a professional guide. In medieval times Norwich was the second most

important city in England and this afternoon you can learn some of the interesting history of our fine city.

     Sports Park: Badminton, Basketball, Fitness Training (with a Fitness Card), Football, Squash,

Swimming or Volleyball.

     Please sign early if you wish to play any of the sports listed above.

1. You can do all the following things during the weekday except ___________.

A. going to the cinema

B. going to the Chinese party

C. taking a historical walking tour

D. taking a mountain climbing tour  

2. The passage may probably be found ___________.

A. in a school's bulletin board

B. in a school's text book

C. in a latest newspaper

D. in a fashion magazine

3. From the passage we know that ___________.

A. students have to pay for the film tickets  

B. some of the students in the school are Chinese

C. Norwich is the second largest city in Britain

D. the school is closed during the daytime

4 From the passage we can infer that __________.

A. students in the school can have access to computers

B. students in the school only have morning classes

C. the school often serves Chinese food to students

D. every Friday afternoon the students will have a tour