试述技术评价的原则和内容。

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问题:

试述技术评价的原则和内容。

考点:00144企业管理概论00144企业管理概论题库
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为探究原电池的形成条件和反应原理,某同学设计了如下实验,并记录了实验现象:

①向一定浓度的稀硫酸中插入锌片,看到有气泡生成;

②向上述浓度的稀硫酸中插入铜片,没有气泡生成;

③将锌片与铜片上端接触并捏住,一起插入上述浓度的稀硫酸中,看到铜片上有气

泡生成,且生成气泡的速率比实验①中快;

④在锌片和铜片中间接上电流计,再将锌片和铜片插入上述浓度的稀硫酸中,发现

电流计指针偏转.

下列关于以上实验设计及现象的分析,不正确的是(   )

A.实验①、②说明锌能与稀硫酸反应而铜不能

B.实验③说明发生原电池反应时会加快化学反应速率

C.实验③说明在该条件下铜可以与稀硫酸反应生成氢气

D.实验③、④说明该原电池中铜为正极、锌为负极

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.

Driving to a friend's house on a recent evening, I was attracted by the sight of the full moon rising just above my friend’s rooftops. I stopped to watch it for a few moments, thinking about what a pity it was that most city people? Myself included? Usually miss sights like this because we spend most of our lives indoors.

My friend had also seen it. He grew up living in a forest in Europe, and the moon meant a lot to him then. It had touched much of his life.

 I know the feeling. Last December I took my seven-year-old daughter to the mountainous jungle of northern India with some friends. We stayed in a forest rest-house with no electricity or running hot water. Our group had campfires outside every night, and indoors when it was too cold outside. The moon grew to its fullest during our trip. Between me and the high mountains lay three or four valleys. Not a light shone in them and not a sound could be heard. It was one of the quietest places I have ever known, a bottomless well of silence. And above me was the full moon, which struck me deeply.

Today our lives are filled with glass, metal, plastic and fibre-glass. We have televisions, cell phones, pagers, electricity, heaters and ovens and air-conditioners, cars, computers.

Struggling through traffic that evening at the end of a tiring day, most of it spent indoors, I thought: before long, I would like to live in a small cottage. There I will grow vegetables and read books and walk in the mountains And perhaps write, but not in anger. I may become an old man there, and wear the bottoms of my trousers rolled and measure out my life in coffee spoons. But I will be able to walk outside on a cold silent night and touch the moon.

71.The best title for the passage would be______.

A. Touched by the moon

B. The pleasures of modern life

C. A bottomless well of silence

D. Break away from modern life

72. The writer felt sorry for himself because________.

A. there was too many pollution

B. he failed to see the fullest moon

C. he didn’t adapt to modern inventions

D. there were too accidents on the road

73. What impressed the writer most in the mountainous jungle of northern India?

A. No modern equipment     B. Complete silence.

C. The nice moonlight        D. The high mountains

74. Modern things (Paragraph 4) are mentioned mainly to______.

A. show that the writer likes city life very much

B. tell us that people greatly benefit from modern life

C. explain that people have less chances to enjoy nature

D. show that we can also enjoy nature at home through them

75. The author wrote the passage to_______.

A. express the feeling of returning to nature

B. show the love for the moonlight

C. advise modern people to learn to live

D. want to communicate longing for modern life

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下图为一个简单的因特网示意图。其中,路由器Q的路由表中到达网络40.0.0.0的下一跳步IP地址应为______。

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H.248属于呼叫控制协议。

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为什么要规定滚动轴承的游隙?

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