单词：two-stage ammonia-water absorption refrigerating machine
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Water is a necessary resource for the health and survival of living things. But the availability of fresh water is decreasing for much of the worlds population. The United Nations estimates that about 3.6 billion people currently live in areas that f
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New design produces flexible panels using only 1-2 percent as much silicon Art Chimes | Washington, DC 19 February 2010 You can use 100 times less silicon. And that's potentially very significant. Harry Atwater Schematic diagram of the light-trapping
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BEIJING, Jan. 2 (Xinhua) -- The first phase of the eastern route of China's south-north water diversion project is expected to be completed ahead of schedule, authorities said. With the main part of the first-stage construction to be finished in Marc
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In a small zoo camel asked his mother: Mom Mom, why do we so long eyelashes? Camel mother said: When the wind came, the long eyelashes will enable us to be able to see the direction of the storm. small camel asked: Mom Mom, why do we camels back then
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Voice 1 Hello. Im Ruby Jones. Voice 2 And Im Marina Santee. Welcome to Spotlight. This programme uses a special English method of broadcasting. It is easier for people to understand, no matter where in the world they live. Voice 1 Maiba presses a coo
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She walked up to the drink machine. She fed it a dollar bill. She pushed the button for a cherry soda. The machine buzzed. Then it said, We're so sorry. We cannot accept your money for this product. It has calories, and you are overweight. Please sel
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