2008年北京奥运会祥云火炬的燃料为丙烷(C3H8)。下列关于丙烷的说法不正确的

题型:选择题

问题:

2008年北京奥运会祥云火炬的燃料为丙烷(C3H8)。下列关于丙烷的说法不正确的是(  )

A.属于烷烃   

B.分子中含有碳碳双键

C.丙烷燃烧是放热反应 

D.丙烷充分燃烧生成二氧化碳和水

考点:烷烃的通式环烷烃(环己烷、环丙烷等)甲烷烷烃的通性
题型:选择题

We are all busy talking about and using the Internet, but how many of us know about the history of the Internet?

  Many people are surprised when they find that the Internet was set up(建立) in the 1960s. At that time, computers were large and expensive. Computer networks(网络) didn’t work well. If one computer in the network broke down, then the whole network stopped. So a new network system(系统) had to be set up. It should be good enough to be used by many different computers. If part of the network was not working, information could be sent through another part. In this way the computer network system would keep on working all the time.

  At first, the Internet was only used by the government, but, in the early 1970s, universities, hospitals and banks were allowed to use it too. However, computers were still expensive and the Internet was difficult to use. By the start of the 1990s, computers become cheaper and easier to use. Scientists had also developed software(软件) that made “surfing(浏览)” the Internet more convenient (方便).

  Today it is easy to get on-line and it is said that millions of people use the Internet every day. Sending e-mail is more and more popular among students.

The Internet has now become one of the most important parts of people’s life.

根据短文内容,选择正确答案(10分)

小题1:The Internet has a history of ______ years.

A、about 40             B、less than 30         C、more than 45

小题2:Scientists set up a new network system to ______.

A、make the computer cheaper

B、make the system work well

C、make the computer go well

小题3:The Internet was widely used in the ______.

A、1960s                B、1970s                C、1990s

小题4:The underlined words “get on-line” in Chinese mean ______.

A、上机               B、上网                 C、接线

小题5:Which of the following is NOT true?

A、People had enough softwares to get on-line fifteen years ago

B、Computers are much cheaper than before.

C、Today the Internet is used everywhere.

题型:选择题

远洋船舶保险中,如果船舶在保险期限内连续发生多次事故造成部分损失,累计损失额超过保险金额,则( )。

A.保险责任终止

B.对累计损失额超过保险金额以上的部分,保险人不予赔偿

C.只要每次损失的金额不超过保单载明的保险金额限度,保险人仍负责赔偿

D.在投保人补交保险费的情况下,对累计损失额超过保险金额以上的部分,保险人仍负责赔偿

题型:选择题

近年来,党中央、国务院根据国内外经济形势的变化,审时度势,从容应对,对宏观调控政策进行了及时、灵活的调整。阅读材料,回答问题。

表2008年下半年以来我国部分税收政策的调整情况

结合材料,运用政治生活知识,概括说明我国税收政策的调整是如何体现政府宗旨的。

__________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

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患者,8岁,诊断为小儿肺炎,经实验室检查确诊为金黄色葡萄球菌肺炎,对青霉素耐药。应首选的抗生素是()

A.氯霉素

B.红霉素

C.氨苄青霉素

D.苯唑西林钠

E.先锋霉素

题型:选择题

在采样过程中,增加了子样数目,可()。

A、提高采样精密度

B、降低采样精密度

C、降低采样准确度

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