问题 单项选择题

三个可靠度R均为0.8的部件串联构成一个系统,如下图所示,则该系统的可靠度为()

A.0.240

B.0.512

C.0.800

D.0.992

答案

参考答案:B

阅读理解与欣赏

阅读下面的文字,完成1~3题。

  “微”是一种平等的力量微博的本质是什么?是一种不超过140个字符的片段式言说,是一种无时无地不在的即时通讯,还是一种人际交流的崭新模式?

  作为一种全新的媒体形态,微博最为人津津乐道的,是其即时性和互动性的特征。一条信息随着微博用户“滚雪球”式转发,一传十,十传百,可以在几分钟甚至几秒钟之内获得千万次的阅读,这是传统媒体难以比拟的。

  然而,微博的意义远不止于“快速”。不同于传统媒体环境中“传”者与“受”者的显著分野,微博是一种平等的交流方式。传统互联网时代,有这样一句名言:“在网上,没有人知道你是一条狗。”而在Web2.0时代,我们借用这句话说:“在微博上,没有人在乎你是机构还是个人。”在微博上,无论你是机构,还是名人,都同普通用户拥有完全平等的发言权,“人人都有麦克风”,在这里得到了最好的诠释。

  平等也意味着选择的空间。在微博上,一条留言被阅读的次数,决定于发言者被关注的程度。微博允许用户自由选择发言者予以关注,“听”与“不听”,“听”谁说的权利,全在于每位网民自己手中。诚然,作为政府和社会组织,有着吸引更多“粉丝”的天然资本,然而,从长远来看,能否取得更多公众的稳定关注,本质上取决于政府的发言质量,是否坦诚,是否贴近,是否有用。

  “微”是一种琐碎的表达。140个字符容量限制,意味着寥寥数语即可成篇。这使不善言者增添自信,也决定了这个平台拒绝宏大叙事,拒绝长篇大论,拒绝高高在上。对于政府和机构而言,要在这个平台上更有效地发言,更有效地影响公众,就必须抛弃“公文式语言”,适应这种平实的、人性化的交流,精思慎言,依靠有效的信息、坦诚的交流来吸引关注,留住“粉丝”。

  “与其在别处仰望,不如在这里并肩”,这是国内某微博的广告语。对于普通网民而言,当原本需要“仰望”而略显“遥远”的政府机关化身为自己关注的列表中的一个普通的ID,“政府机关”便也具备了如同面对面朋友般的亲近与亲和感。政府微博上,一条条柴米油盐的信息可能显得细微甚至平淡,但在这种细微和平淡的交流背后,正是执政理念的不断进步,政治文明的点滴彰显。(选自2010年9月21日《人民日报》,有删改)

1.下列对“微博的本质”的理解,符合作者所要强调的意思的一项是(     )

A.微博是一种琐碎的表达,是有140个字符容量限制的片段式言说。

B.微博是一种无时无地不在的即时通讯,具有即时性和互动性特征。

C.微博是一种人际交流新模式,以平等的交流方式区别于传统媒体。

D.微博是一种为人津津乐道的全新的媒体形态,传统媒体难以比拟。

2.下列对文中四句引文作用的分析,不恰当的一项是(     )

A.“在网上,没有人知道你是一条狗”,是说传统互联网具有匿名性特点。

B.“在微博上,没有人在乎你是机构还是个人”,是说在微博上人人平等。

C.“人人都有麦克风”,是说在机构、名人之后,普通用户才拥有发言权。

D.“与其在别处仰望,不如在这里并肩”,点明微博具有平等交流的实质。

3.下列对“'微'是一种平等的力量”的理解,不符合文章意思的一项是(     )

A.在微博上,每个人、每个机构或组织都拥有完全平等的发言权。

B.每位网民都有选择的空间,有自由选择发言者并予以关注的权利。

C.政府机关与普通网民细微和平淡的交流拉近了两者之间的距离。

D.政府和机构能在微博平台上更有效地发言,更有效地影响公众。

阅读理解

阅读理解

     England is not a big country: from north to south and from east to west it is only about three hundred

miles across.   But for a small country it has a surprising range of climate.  People who have never visited

England, or who have visited only one part of it, often make the mistake of thinking that it is a cold and

wet country, except for the summer months of June to September.  This is probably true of the north of

England and the Midlands.  In the south, however, the climate is much more pleasant.   One result is that

when people retire from a job in the north they often prefer to move down to the milder south.

      Perhaps the warmest part of the country is thesouthwest, which consists of the countries of Devon and

Cornwall.  The warm Gulf Stream flows across the North Atlantic Ocean from the Gulf of Mexico and

makes the coastal regions of the southwest quite warm.  Palm trees, bamboo and many semi-tropical

plants grow well in the southwest of England.  Flowers and vegetables ripen as much as a month earlier

than those elsewhere.  Farmers in the area obtain a higher price for their vegetables and flowers because

they are ready earlier.  In winter there may be several feet of snow in other parts of England but there

will probably be no snow at all in the southwest.  This may be one of the reasons why the southwest is

one of England's most popular holiday areas.

1.  The distance from the center of England to south coast is about        

A.  one hundred miles

B.  three hundred miles

C.  one hundred and fifty miles

D.  six hundred miles

2.  England is a country         .  

A.  with a cold and wet climate

B.  with a surprising climate

C.  with a pleasant climate

D.  with a variety of climates

3.  According to the passage        

A.  flowers and vegetables from Devon are on themarket one month earlier

B.  farmers in the southwest grow as many vegetables and flowers as farmers elsewhere

C.  people in the southwest have to pay a higher price for vegetables and flowers

D.  vegetables in Comwall ripen as much as a month earlier than flowers

4. In the north of England and the Midlands,      

A.  it is cold and wet all the year round

B.  the climate is pleasant as a whole

C.  it is warm most of the time in a year

D.  only the summer is not cold and not wet