【简答题】【消耗次数：1】
什么是材料的导热性？材料导热系数的大小与哪些因素有关？
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【简答题】
水的导热系数_____ 密封空气的导热系数，所以材料吸水后的绝热性能降低。
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滚动阻力系数与哪些因素有关？
【多选题】
绝热材料的导热系数与含水率的不正确关系是（）。
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A含水率越大，导热系数越小
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B导热系数与含水率无关
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C含水率越小，导热系数越小
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D含水率越小，导热系数越大
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