问题
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A diesel engine burns _____ a gasoline engine of the same capacity in the same period of time.
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For the limited-capacity tour programs, the use of _____ is a convenient way to reduc
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It is obvious that the expansion of the water ______ the increase of its temperature.A.is
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Because of the reduced _____ in the vacuum boiling evaporator, some of the sea water boils
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The designed capacity is 25 tons a day, but the fresh water generator can only _____ 22 to
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We can t emphasize ______ the importance of air and water for the survival of all species.
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