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【简答题】
简述 长时间运动时酮体的生成有何意义?
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【单选题】降低电源电压调速机械特性硬度（ ），调速平滑性好，损耗较小，投资较大。不变
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【单选题】Why is the woman glad that the saw the man?
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【简答题】A．The woman wants to explain the experiment. B．The woman wants to observe the experiment. C．The man suggests they should stay with experiment. D．The man is sorry for the insecure experiment.
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【单选题】What disappointed us was that their determination finally ___.
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【单选题】What does the woman mean?
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【单选题】When he opened the box, it ____________ a bad smell.
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