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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Modern centrifuge designs enable continuous over a considerable period of timeThis is achi
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The periods of light and darkness the moon created were the first accepted periods of time
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The cooling water temperature should be gradually reduced over a period of (),and then sh
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If over a period of time, the oi1 film partially disappears, so that dry areas are formed
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A patent gives inventors exclusive rights to their inventions for a fix period of time.
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