试题与答案

一个字节多路通道连接D1、D2、D3、D4、D5共5台设备,这些设备分别每10μs、

题型:问答题

题目:

一个字节多路通道连接D1、D2、D3、D4、D5共5台设备,这些设备分别每10μs、30μs、30μs、50μs和75μs向通道发出一次数据传送的服务请求,请回答下列问题:

如果设计字节多路通道的最大流量正好等于通道实际流量,并假设对数据传输率高的设备,通道响应它的数据传送请求的优先级也高。5台设备在0时刻同时向通道发出第一次传送数据的请求,并在以后的时间里按照各自的数据传输率连续工作。画出通道分时为每台设备服务的时间关系图,并计算这个字节多路通道处理完各台设备的第一次数据传送请求的时刻。

答案:

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题型:阅读理解

The World Trade Organization (WTO) founded on January 1, 1994, aims to encourage international trade to flow as freely as possible, making sure that trade agreements are respected and that any disputes (争端) can be settled.

In the five years since its founding, the WTO has become well-known as one of the world’s most powerful economic organizations, taking its place alongside the World Bank and International Monetary Fund.

The system of global rules for international trade, however, dates back half a century to 1948 when the General Agreement on Tariffs (关税) and Trade (GATT) was formed after World War II.

As time went by it became clear that the GATT had two major drawbacks—the limited areas of trade it covered, and the lack of an effective system to settle disputes.

After seven years of trade talks ending in 1994. the so-called Uruguay Round finally gave birth to the WTO, complete with an effective system to settle disputes and new rules covering trade in services and intellectual property (知识产权).

Even after seven years of talks and 22500 pages of agreements there were still problems, especially the difficult-to-deal-with areas of agriculture and services.

The WTO. with its head office in Geneva, has 135 members with 30 more waiting to join.

小题1:Compared with the GATT, the WTO _____.

A.can do better to settle disputes in more areas of international trade

B.got its members to sign the agreements more easily

C.has got too many areas of international trade to deal with to work effectively

D.didn’t pay enough attention to services and intellectual property小题2:In the new century the WTO will _____.

A.take the place of the World Bank and International Monetary Fund

B.have new rules covering trade in services and intellectual property

C.make complete new rules in every area of international trade

D.have more members and do much more to settle more problems小题3:The underlined word “drawbacks” probably means _____.

A.weak points

B.changes

C.strong points

D.improvements小题4:The best title for the passage is _____.

A.WTO—Another Name for GATT

B.WTO—an International Service Organization

C.WTO—One of the World’s Strongest Economic Organizations

D.WTO—the World’s Most Powerful Economic Organization

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题型:问答题

用a、b两单色光分别照射同一双缝干涉装置,在距双缝恒定距离的光屏上得到如图所示的干涉图样,其中图甲是单色光束a照射时形成的图样,图乙是单色光束b照射时形成的图样,则下列关于a、b两束单色光的说法中,正确的是(  )

A.若光束a照在某金属上恰能发生光电效应,则光束b照到该金属上不能发生光电效应

B.若两束光都能使某金属发生光电效应,则光束a照到该金属表面到电子逸出的时间间隔明显比光束b长

C.它们在真空中具有相同大小的传播速度

D.在相同条件下,光束a比光束b更容易产生明显的衍射现象

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