发电机定子冷却水中断的原因有哪些?

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问题:

发电机定子冷却水中断的原因有哪些?

考点:集控值班员考试汽机运行汽机运行题库
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根据句意和首字母提示补全单词。

     Do you K __1__ Nie Haisheng and Fei Junlong? They are b __2__ astronauts (宇航员). They went

 (去) to the space (太空) by (乘) the Shenzhou Ⅵ spacecraft (宇宙飞船). They are cool. They are in

 gray c __3__ then. They f __4__ the earth (地球) is small. Mr.Nie and Mr.Fei are good friends. They

  are o __5__ pride (骄傲).

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经济适用房必须满(),才能直接上市交易。

A.2年

B.3年

C.5年

D.10年

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Modern inventions have speeded up people's lives amazingly. Motor cars cover a hundred miles in light more than an hour, aircraft cross the world inside a day, while computers operate at lightning speed. Indeed, this love of speed seems never ending. Every year motor cars are produced which go even faster and each new computer boasts(吹嘘) of saving precious seconds in handling tasks.

All this saves time, but at a price.When we lose or gain half a day in speeding across the world in an airplane, our bodies tell us so. We get the uncomfortable feeling known as jet lag;our bodies feel that they have been left behind in another time zone. Again, spending too long at computers results in painful wrists and fingers. Mobile phones also                   , according to some scientists;too much use may put harmful radiation into our brains, a consequence we do not like to think about.

However, what do we do with the time we have saved? Certainly not relax, or so it seems. We are so accustomed to constant activity that we find it difficult to sit and do nothing or even just one thing at a time. Perhaps the days are long gone when we might listen quietly to a story on the radio, letting imagination take us into another world.

There was a time when some people's lives were devoted simply to the cultivation(耕耘) of the land or the care of cattle. No multi tasking there;their lives went on at a much gentler pace, and in a familiar pattern. There is much that we might envy about a way of life like this. Yet before we do so, we must think of the hard tasks our ancestors faced: they farmed with bare hands, often lived close to hunger, and had to make tools from wood and stone. Modern machinery has freed people from that primitive existence.

小题1:What's the passage mainly about?(within 10 words)

                                                                       

小题2:List the difficulties our ancestors met according to the text.(within 15 words)

                                                                      

                                                                      

                                                                      

小题3:Fill in the blank in the 2nd paragraph with proper words or phrases.

                                                                       

小题4:Why do we make new products more and more time-saving according to Paragraph 1 of this passage?

                                                                       

小题5:Translate the underlined sentence in the 3rd paragraph into Chinese.

                                                                       

                                                                       

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如图,原长分别为L1和L2,劲度系数分别为k1和k2的轻质弹簧竖直地悬挂在天花板上,两弹簧之间有一质量为m1的物体,最下端挂着质量为m2的另一物体,整个装置处于静止状态.现用一个质量为m的平板把下面的物体竖直地缓慢地向上托起,直到两个弹簧的总长度等于两弹簧原长之和,这时托起平板竖直向上的力是多少?m2上升的高度是多少?

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商品数量越多,边际效用越大,价格越高。

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