【判断题】【消耗次数:1】
材料的导热系数越大,其保持隔热性能越好。
正确
错误
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相关题目
【判断题】 多孔材料吸水后,其保温隔热性能变差。
①  正确
②  错误
【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。
【单选题】 通常将导热系数不大于()的材料称为隔热材料
①  0.23
②  0.24@0.26
③  0.31
【简答题】 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?
【多选题】 关于材料的导热系数,以下正确的是()。
①  A容重轻,导热系数小
②  B含水率高,导热系数大
③  C孔隙不连通,导热系数大
④  D固体比空气导热系数大
【判断题】 导热性是指材料传导热量的能力(冬季材料保持热量不传递出去;夏季材料阻碍热量传入室内)。
①  正确
②  错误
【判断题】 材料的软化系数越大,则材料的耐水性越好。
①  正确
②  错误
【判断题】 软化系数越大,说明材料的抗渗性越好。
①  正确
②  错误
【判断题】 导热率的大小是表征导热效果的好坏,导热率越大导热效果越好。
①  正确
②  错误
【判断题】 材料的渗透系数越小,抗渗性能越好。
①  正确
②  错误
随机题目
【单选题】 He was a good swimmer so he ___ swim to the river bank when the boat sank.
①  could
②  might
③  should
④  was able to
【单选题】 No sooner ___ he arrived home than he ___ to start on another journey.
①  has; was asked
②  have; were asked
③  had; is asked
④  had; was asked
【单选题】 This pencil is ______ than that one.
①  longest
②  long
③  longer
④  as long
【单选题】 This book is ______ that one, but ______ than that one.
①  as difficult as; expensive
②  as more difficult as; more expensive
③  as difficult as; more expensive
④  more difficult as; as expensive
【单选题】 I think the story is not so ______ as that one.
①  Interesting
②  interested
③  more interesting
④  most interesting
【单选题】 This box is ______ that one.
①  heavy than
②  so heavy than
③  heavier as
④  as heavy as
【单选题】 These children are ______ this year than they were last year.
①  more tall
②  more taller
③  very taller
④  much taller
【单选题】 My mother is no ______ young.
①  shorter
②  longer
③  little
④  few
【单选题】 I think science is ______ than Japanese.
①  much important
②  important
③  much more important
④  more much important
【单选题】 What ___ if I drink this?
①  happens
②  is happening
③  will happen
④  is happened