阅读以下关于中断的叙述,回答问题1至问题4,将答案填入答题纸的对应栏内。【说明】在某

题型:问答题

问题:

阅读以下关于中断的叙述,回答问题1至问题4,将答案填入答题纸的对应栏内。

【说明】

在某嵌入式系统中。王工设计的计算机模块如图4-1所示。它要求CPU在执行完当前指令后转而对中断请求进行处理。假定:TDC为查询链中每个设备的延迟时间,Ta、Tb、Tc分别为A、B、C的中断服务程序所需的执行时间,TS和TR为保存现场和恢复现场所需的时间

本系统不允许中断镶嵌,如果CPU响应中断,则中断处理过程按照如下流程执行,将(1)~(5)的内容填入答案纸上相应的位置。

考点:计算机软件水平考试中级嵌入式系统设计师2011年下半年嵌入式设计师下午试题
题型:问答题

To get a chocolate out of a box requires a lot of unpacking: the box has to be taken out of the paper bag in which it arrived, the cellophane (玻璃纸) wrapper has to be torn off, the lid opened and the paper removed, the chocolate itself then has to be unwrapped from its own piece of paper. But this overuse of wrapping is not limited to luxuries. It is now becoming increasingly difficult to buy anything that is not done up in beautiful wrapping.

The package itself is of no interest to the shopper, who usually throws it away immediately. Useless wrapping accounts for much of the refuse put out by the average London house-hold each week. So why is it done? Some of it, like the cellophane on meat, is necessary, but most of the rest is simply competitive selling. This is absurd. Packaging is using up valuable energy and resources and polluting the environment.

Recycling is already happening with milk bottles which are returned to the dairies (牛奶场), washed out, and refilled. But both glass and paper are being threatened by the growing use of plastic. More dairies are experimenting with plastic bottles.

The trouble with plastic is that it does not rot. Some environmentalists argue that the only solution to the problem of ever increasing plastic containers is to throw away plastic altogether in the shops, a suggestion unacceptable to many producers who say there is no alternative (替代品) to their handy plastic packs.

It is evident that more research is needed into the recovery and re-use of various materials and into the cost of collecting and recycling containers rather than producing new ones. Unnecessary packaging, intended to be used just once, and to make things look better so more people will buy them, is clearly becoming increasingly absurd. But it is not so much a question of throwing away packaging as using it wisely. What is needed now is a more advanced approach to using scarce resources for what is, after all, a relatively unimportant function.

小题1:The underlined part “this overuse of wrapping is not limited to luxuries” in Paragraph l means ______.

A.more wrapping is needed for ordinary products

B.the wrapping used for luxury products is unnecessary

C.more wrapping is used for luxuries than for ordinary products

D.too much wrapping is used for both luxury and ordinary products小题2:Why is packaging important to producers?

A.It is easy to use it again.

B.Packaged things will not go rotten.

C.They want to attract more shoppers.

D.Shoppers are all interested in beautiful packaging.小题3:According to the passage, dairies are ______.

A.reusing their paper containers

B.giving up the use of glass bottles

C.increasing the use of plastic bottles

D.experimenting with the use of paper bottles小题4:Some environmentalists think that ______.

A.too much plastic is wasted

B.shops should stop using plastic containers

C.no alternative can be found to plastic packaging

D.plastic packaging should be made more convenient

题型:问答题

想一想,下面三个词为什么归纳在一起?然后从所给的四个词中选出一个与它们同类.陶瓷、玻璃、水泥(  )

A.光导纤维

B.有机玻璃

C.人造纤维

D.砖瓦

题型:问答题

金字塔是古代埃及文明的象征,它是埃及最高统治者的[ ]

A.宫殿

B.陵墓

C.行宫

D.祭坛

题型:问答题

秋季一些植物的叶子会变红,主要是因为这些植物的叶中含有大量()。

A.叶绿素

B.叶黄素

C.花青素

D.胡萝卜素

题型:问答题

赵某在火车上偷得某军人的一个手提包,内装人民币5000元及手枪1支、子弹5发,均藏于身上。数月以后,赵某被捕,因为赵某的行为构成______。

A.盗窃罪

B.盗窃枪支弹药罪

C.盗窃罪和盗窃枪支弹药罪

D.盗窃罪和私藏枪支弹药罪

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