问题 多项选择题

某施工单位承建一居民楼,现浇混凝土框架结构,自拌C30混凝土,内隔墙采用加气混凝土砌块双坡屋面,防水材料为3mm厚SBS防水卷材,外墙为玻璃幕墙。生产技术科编制了安全专项施工方案和环境保护方案。一层混凝土浇捣时,项目部对现场自拌混凝土容易出现强度等级不够的质量通病,制定了有效的防治措施。一层楼板混凝土浇筑完毕后,质检人员发现木工班组不按规定拆模。

针对现场自拌混凝土容易出现强度等级偏低,不符合设计要求的质量通病,项目部制定了下列防治措施,正确的有()。

A.周转模板不清理

B.控制好混凝土的浇筑振捣质量

C.混凝土拌和必须采用机械拌制,加料顺序为:水—水泥—细集料—粗集料,并严格控制搅拌时间

D.混凝土的运输和浇捣必须在混凝土初凝前进行

E.拌制混凝土所用的水泥、集料和外加剂等均必须符合有关标准规定

答案

参考答案:B, D, E

问答题
阅读理解

Everybody hates it,but everybody does it.A recent report said that 40%of Americans hate tipping.But why do tips exist?

The common opinion in the past was that tips both rewarded the efforts of good service and reduced uncomfortable feelings of inequality.It is believed that the better the service is,the bigger the tip will be.

But according to a new research from Cornell University,tips no longer serve any useful function.The paper analyzes number they got from 2,547 groups dining at 20 different restaurants.The connection between larger tips and better service was very weak.

Tipping is better explained by culture than by the money people spend.In America,tipping is regarded as part of the accepted cost of a service.In New York restaurants,failing to tip at least 15%could well mean dissatisfaction from the customers Hairdressers can expect to get 15%一20%.and the mall who delivers your fast food should be paid$2.In Europe,tipping is less common.In many restaurants the amount of tip is decided by a standard service charge In many Asian countries,tipping has never really caught on at a11.Only a few have really taken to tipping。

According to Michael Lynn,the Cornell papers’author,countries in which people are more social or outgoing tend to tip more.tie says,“In America,where people are expressive and eager to mix up with others,tipping is about social approval If you tip badly,people think less of you .Tipping well is a chance to show off.”

68.This passage is mainly about        

A.different kinds of tipping in different countries

B.the relationship between tipping and countries

C.the origin and present meanings of tipping

D.the reason why American people hate tipping

69.Which of the following best explains the underlined phrase“caught on”in paragraph 4?

A.been hated      B.become popular   C.been stopped    D.been permitted

70.Eating in a well—known restaurant in New York,who is likely to tip most?

A.A Frenchman.    B.A Chinese.  C.A Japanese.    D.An American.

71.We can infer from this passage that        .

A.tipping is no longer a good way to satisfy some customers themselves

B.tipping has something to do with people’s character

C.tipping in America can make service better now

D.tipping is no longer popular in New York