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[单选题]
包括物理层规范、链接建立协议、链接管理协议三个基本的规范和协议的是( )
A
IrDA标准b.HomeRFc.WAPd.WDP
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试题答案：
A
答案解释：
【解析】IrDA数据传输技术是一种利用红外线进行点对点通信的技术。IrDA标准包括三个基本的规范和协议：物理层规范、链接建立协议、链接管理协议。
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2．对实时操作系统描述正确的是
下列对数据链路层的功能描述不正确的是( )
物理层协议定义的一系列标准有四个方面的特性，不属于这些特性的是（）
网络协议中涉及用于协调与差错处理的控制信息的要素是( )
38.
用户数据报传输协议UDP提供的服务是( )
ATM的信元头长度为( )
下列方法不能够实现帧同步功能的是( )
26.
在ISO建议的网管功能中对网络拓扑结构及某些网管对象的配置和参数做出调整属于( )
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三个整数a，b，c既成等差数列又成等比数列的充分必要条件是
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8.镜头焦距的含义是
3.
资本主义商品生产过程的特征是（ ）
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finite clause
5.
Passage FourThroughout the past century humanity did everything in its power to control nature. We dammed earth's rivers, chopped down the forests and exhausted the soils. Burning up fuels, we pumped a great deal of greenhouse gases into the air, altering the chemistry of the atmosphere and warming the planet in just a few decades.And as our population began in the year 2000 above the 6 billion mark, still spreading across the continents, dozens of animal and plant species were dying out every, day, including the first primate(灵长类) to disappear in more than 100 years.As the start of the 21st century there were unmistakable signs that nature was beginning to take its revenge. Melting ice in both poles of the earth suggested that the climate was changing rapidly. Weather was even more changeable than usual, giving some places too little rain and others too much.Fires raced across the dried American West last summer, and recent storms spread damages from Britain to China.No specific event could be directly blamed on global warming.Floods and drought will be more frequent and severe.Other sad signs from an overburdened planet include falling grain and fish harvests and fierce competition for scarce water supplies.But there were also, in the year 2000, signs of great awareness.Connected by the Internet, hundreds of millions of people gathered for the 30th anniversary of Earth Day. Governments from Washington to Lima took steps to protect the large wild areas from development. Progress was made toward using more renewable energy from the wind and the sun, and new cars that used both gasoline and electricity spotted(显示) fuel-economy statistics.The goal for the new century is "sustainable development" .Is that possible? It depends on how well we understand that humanity is part of nature, not lord and master.36.What is the result of the human control over the nature?A.Natural resources are being exhausted.B.There is a global warming effect.C.Species of animals and plants are reduced.D.All of the above.
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