问题 问答题

案例:某住宅楼是一幢地上6层、地下1层的砖混结构住宅,总建筑面积3200m2。在现浇顶层一间屋面的混凝土施工过程中出现坍塌事故,坍塌物将与之垂直对应的下面各层预应力空心板依次砸穿,10名施工人员与4辆手推车、模板及支架、混凝土一起落入地下室,造成2人死亡、3人重伤、经济损失26万元人民币的事故。从施工事故现场调查得知,屋面现浇混凝土模板采用300mm×1200mm×55mm和300mm×1500mm×55mm定型钢模,分三段支承在乎放的50mm×100mm方木龙骨上,龙骨下为间距800mm均匀支撑的4根直径100mm圆木立杆,这4根圆木立杆顺向支承在作为第6层楼面的3块独立的预应力空心板上,并且这些预应力空心板的板缝灌缝混凝土浇筑仅4天,其下面也没有任何支撑措施,从而造成这些预应力空心板超载。施工单位未对模板支撑系统进行过计算也无施工方案,监理方也未提出任何异议,便允许施工单位进行施工。出事故时监理人员未在场。

请简要分析本次事故发生的原因。

答案

参考答案:本次事故发生的原因是:在现浇顶层一间屋面的混凝土施工过程中出现坍塌,预应力空心板超载是这次事故发生的直接原因。施工单位事先未对模板支撑系统进行计算也无施工方案,监理方也未提出任何异议,即没有按照规定的程序进行审批,便允许施工单位进行施工,这是事故发生的间接原因。

阅读理解

阅读理解。

     Last month, students from one hundred and three universities in eightyeight countries took part in

an international computer programming contest. The Battle of the Brains took place in Harbin, China. 

 __1__

     Jerry Cain, coach of Stanford University Team  California, says, "One of the programming problems

was trying to figure out how to break an arbitrary chocolate bar into a certain number of pieces of a

certain numb er of sizes and to do it as quickly as possible.    __2__"

     The students first listed the problems in order of difficulty.__3__ They designed ways to test their

solutions. And they wrote needed software systems.  Even the winning team from Shanghai Jiaotong

University in China was not able to solve all the problems within the given time limit.  Stanford's team

solved five problems and finished in the 14th place. Stanford was one of twentyone American universities

that took part in the contest this year.

     __4__ It began in 1970 at Texas A&M University. The contest quickly became popular in the

United States and Canada. It developed and grew as more and more schools took part in local and

area contests.

     The first final competition was held in 1977 at the Association for Computing Machinery Computer

Science conference. Today, a network of universities holds area competitions that send the winners to

the world finals, now organized by IBM. Contest spokesman Doug Heintzman says the world champions

receive prizes and scholarships.  __5__

A. The competitors show real interest in IBM.

B. Then they figured out the requirements of each.

C. And that's probably the simplest of all of them.

D. This competition is an opportunity to be recognized by famous universities from the world.

E. Threeperson teams from each school had five hours to solve eleven real world problems.

F. The official name of the Battle of the Brains is the ACM  International Collegiate Programming Contest.

G. They are also guaranteed an offer of employment with IBM.

单项选择题