下列物质属于硅酸盐材料的是 [ ] A.碳纤维 B.石灰石 C.普通水泥 D.水

题型:选择题

问题:

下列物质属于硅酸盐材料的是  [ ]

A.碳纤维              

B.石灰石    

C.普通水泥              

D.水晶

考点:玻璃、陶瓷、水泥
题型:选择题

IgG被胃蛋白酶水解后抗原性减弱是因为()

A.F(ab′)具有双价抗体活性

B.pFc′被继续降解为小分子片段

C.pFc′不能活化补体

D.pFc′不能结合FcR

E.pFc′不能通过胎盘

题型:选择题

读经纬线示意图,图中虚线是晨昏线,阴影与非阴影部分代表两个不同日期

此刻,甲地地方时为(  )

A.6时

B.15时

C.9时

D.21时

题型:选择题

FIDIC合同条件下,监理工程师的权力有()。

A、任命工程师代表

B、批准承包人授权的驻工地代表

C、根据需要中止承包人的某些义务

D、批准设计图纸或变更

E、批准或拒绝合同的转包

题型:选择题

阅读理解。

     MySpace, the social networking website, is different from other websites which only provide stories about

other people. MySpace is a place that allows you to broadcast your own stories and persona information to as

many people as you like. Started two years ago, it is a big source of information for and about American kids.

     Teenagers and their parents feel very differently about it. Teens are rushing to join the site, not sharing their

parents' worries. It signals yet another generation gap in the digital era.

     For teenagers, it is a reliable network to keep in touch with their friends. They will often list their surnames,

birthdays, after-school jobs, school clubs, hobbies and other personal information.

     "MySpace is an easy way to reach just about everyone. I don't have all the phone numbers of all my

acquaintances. But if I want to get in touch with one of them, I could just leave them a message on MySpace."

said Abby Van Wassen. She is a sixteen-year-old student at Woodland Hills High of Pittsburgh, Pennsylvania.

     Parents on the other hand are seriously concerned about the security problems of MySpace.

     "Every time we hold a parents meeting, the first question is always about MySpace," said Kent Gates, who

travels the country doing Internet safety seminars (研讨会). The National Center for Missing and Exploited

Children has received at least 288 MySpace-related complaints, according to Mary Beth Buchanan, a lawyer in

Pittsburgh.

     "Your profile on MySpace shows all your personal information to anyone on the Web. And MySpace even

lists this information by birthplace and age. It's like a free checklist for troublemakers and it endangers children,"

Buchanan said.

1. From the passage we can learn that MySpace ____.

A. brings about the generation gap

B. is very careful about people's privacy

C. encourages you to list your personal information

D. lists the telephone numbers of your friends

2. Why are some parents against MySpace?

A. Because MySpace has a bad influence on their children.

B. Because they don't want to pay so much money for MySpace.

C. Because it takes up too much of their children's spare time.

D. Because troublemakers can easily approach their children through the site.

3. What can we infer from "Every time we hold a parents meeting, the first question is always about MySpace"?

A. MySpace has become a top issue troubling parents.

B. MySpace often holds parents meetings.

C. MySpace is quite popular-with parents.

D. Parents have lots of questions about the website.

4. The writer's attitude towards MySpace is ____.

A. negative

B. positive

C. optimistic

D. objective

题型:选择题

NB/T47014-2011《承压设备焊接工艺评定》中规定,当增加或变更次要因素时,不需要重新评定,亦不需要重新编制预焊接工艺规程。()

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