一个两位的质数,如果将它的十位数字与个位数字交换后,仍是一个两位的质数,这样的

题型:填空题

问题:

一个两位的质数,如果将它的十位数字与个位数字交换后,仍是一个两位的质数,这样的

质数可称为“特殊质数”。这样的“特殊质数”有     个。

考点:有理数定义及分类正数与负数数轴相反数
题型:填空题

鲁迅唯一的表现爱情题材的小说是()

A.《离婚》

B.《祝福》

C.《伤逝》

D.《风波》

题型:填空题

利用船首叠标导航,叠标方位270°,驶真航向265°时,恰好保持前后标成一直线,表明()。

A.船舶应向右转向

B.受较大东北流的影响

C.罗经有偏差

D.B或C

题型:填空题

A little under one-third of U.S. families have no Internet access and do not plan to get it, with most of the holdouts seeing little use for it in their lives, according to a survey released on Friday.

Park Associates, a Dallas-based technology market research firm, said 29 percent of U.S. families, or 31 million homes, do not have Internet access and do not intend to subscribe(预订)to an Internet service over the next 12 months. The second annual National Technology Scan conducted by Park found that the main reason why potential customers say they do not subscribe to the Internet is because of the low value to their daily lives rather than concerns over cost.

Forty-four percent of these families say they are not interested in anything on the Internet, versus just 22 percent who say they cannot afford a computer or the cost of Internet service, the survey showed. The answer “I’m not sure how to use the Internet” came from 17 percent of participants who do not subscribe. The response “I do all my e-commerce shopping and YouTube-watching at work” was cited by 14 percent of Internet-access users. Three percent said the Internet doesn’t reach their homes.

The study found U.S. broadband adoption grew to 52 percent over 2006, up from 42 percent in 2005. Roughly half of new subscribers converted(转变)from slower-speed, dial-up Internet access while the other half of families had no prior access.

“The industry continues to chip(击破)away at the core of non-subscribers, but has a long way to go,” said John Barrett, director of research at Parks Associates. “Entertainment applications will be the key. If anything will pull in the holdouts, it’s going to be applications that make the Internet more similar to pay-TV,” he predicted.

41. What does the underlined word “holdouts” in the first paragraph most probably mean?

A. some American families

B. those who hold out one’s opinions

C. those who have been surveyed

D. those who still haven’t access to the Internet currently

42. Many potential customers refuse to subscribe to the Internet mainly because _________.

A. they show too much concern about the cost B. they can find little value of it

C. they do most YouTube-watching at work D. the Internet doesn’t reach their homes

43. From the passage we can infer that ________.

A. It is not an easy job to transform those holdouts into the Internet users

B. people will adopt dial-up Internet access no more

C. many Americans enjoy doing e-commerce shopping at home

D. more than half of the population are using the Internet in 2005

44. According to John Barrett, what is the key to attracting more U.S. families to broadband service?

A. making the Internet look more similar to TV set

B. applying the Internet more to entertainment

C. providing more pay-TV programs

D. chipping away at the core of non-subscribers

45. Which is the best title for the passage?

A. Web develops with technology               B. The present situation of web

C. Many Americans see little point to web    D. It is urgent to promote web service

题型:填空题

木材防腐可采取两方面的措施:一是保证有良好的(),防止木材产生冷凝水,二是涂刷或浸溃各类防腐剂进行防腐处理。

题型:填空题

建设工程项目总承包方式的核心是()。

A.实行总价包干

B.业主可行到“交钥匙工程”

C.实现设计单位和施工单位相互融合

D.为项目建设增值

E.实现设计与施工过程的组织集成

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