试题与答案

结合水与自由水的性质主要区别:()、()等。

题型:填空题

题目:

结合水与自由水的性质主要区别:()、()等。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:被动攻击解析:[知识点] 网络安全的基本概念 [评析] 在X.800中将安全攻击分为两类:被动攻击和主动攻击。被动攻击试图了解或利用系统的信息,但不影响系统资源。主动攻击试图改变系统资源或影响系统运作。

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题型:阅读理解

The Wall Street Journal Asia Edition (U.S.), the Globe and Mail (Canada), the Guardian (U.K.), among other foreign news agencies, have recently published articles on China's earthquake relief. They have all praised the earthquake relief efforts made by the Chinese government.

The Wall Street Journal Asia Edition published an article on May 21 saying that on the eighth day of the most serious natural disaster to hit China in decades, the main task of rescuing survivors from the ruins had been quickly replaced by the great challenge of helping them. The article said that people overseas have been deeply impressed by earthquake relief efforts by the Chinese government.

The Associated French Press (AFP) reported on May 21 that China has become more open in the whole rescue action.

Aircraft loaded with relief supplies from Ukraine, Russia, the United States, Singapore and many other countries have arrived in disaster areas in southwestern China.

The Associated Japanese Press (AJP) published an article on May 21 reporting that China is making great efforts to deal with a formidable task caused by the earthquake how to provide temporary shelter for so many people. The article said that many tents have been built; and food and medical care are provided to the people whose lives have been completely disrupted(搅乱)by the earthquake.

The Global and Mail of Canada published an article on May 20 that said the rapid earthquake relief work in Sichuan shows China's powerful economic strength.

An article carried in the British Guardian said that one week after the Sichuan earthquake, China began a three-day national mourning(哀悼) period at 14:28 on May 19, and all Chinese people stood in silence for three minutes in memory of the victims.

The ongoing search and rescue action are still encouraged by one unexpected survivor after another. Chinese officials said that, so far, no epidemic(流行病) had occurred after the earthquake.

61. How many press media are mentioned in the article?

A. 3      B. 4       C. 5     D. 6

62. what is the possible meaning of the underlined word formidable in paragraph 4 ?

A. difficult     B. quick      C. light       D. heavy

63. According to the passage, what is the most difficult and important task in the earthquake-hit areas for the present ?

A. rescuing survivors        B. providing temporary shelter and food for the victims

C burying dead bodies       D. clearing away the ruins

64. What is the best title of the passage?

A. Foreign media praise China's earthquake relief

B. The rapid earthquake relief work in Sichuan shows China's powerful economic strength

C. The most serious natural disaster to hit China in decades

D. Tens of thousands of people’s lives have been completely disrupted by the earthquake.

65. Which of the following is NOT true according to the passage ?

A. Chinese government made great efforts to relieve the people after the earthquake

B. many countries in the world provide China with the relief sup C. in the earthquake-hit areas, people’s lives have been completely disrupted by the earthquake

D. the ongoing search and rescue action have completely stopped at the present time 

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题型:选择题
电气化铁路的输电线常用图所示的方式悬挂在钢缆上.钢缆的A端固定在电杆上,B端连接在滑轮组上.滑轮组由a、b、c三个滑轮构成,配重P由多个混凝土圆盘悬挂在一起组成,配重的总重为G,若不计摩擦和滑轮的重量,则以下说法中正确的是(  )

A.a为动滑轮,B端钢缆受到滑轮组的拉力大小约为3G

B.a为动滑轮,B端钢缆受到滑轮组的拉力大小约为G

C.a、c为动滑轮,B端钢缆受到滑轮组的拉力大小约为3G

D.a、c为动滑轮,B端钢缆受到滑轮组的拉力大小约为G

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