【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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相关题目
【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
【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。
【判断题】 材料的导热系数越大,其保持隔热性能越好。
①  正确
②  错误
【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
【单选题】 导热系数λ小于( )的材料称为绝热材料。
①  0.13
②  0.32
③  0.12
④  0.23
【简答题】 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()。
①  A含水率越大,导热系数越小
②  B导热系数与含水率无关
③  C含水率越小,导热系数越小
④  D含水率越小,导热系数越大
【单选题】 ()由于具有良好的导热性能、电性能、加工性能以及较低的价格被用作主要的引线框架材料。
①  A.复合材料
②  B.铜合金
③  C.钛合金
④  D.铝合金
【单选题】 合成高分子材料的导热系数( )。
① 
② 
③  不确定
【单选题】 材料传导热量的能力称为( )。
①  比热
②  热容
③  导电性
④  导热性
随机题目
【单选题】 The poor child was ( ) by his parents soon after his birth.
①  accomplished
②  assured
③  astute
④  abandoned
【单选题】 They teach the computer to think and ( ) develop and sharpen their own reasoning abilities.
①  result in
②  result from
③  as a result
④  with result
【单选题】 The song never failed to ( ) his spirits.
①  overcome
②  utilize
③  exercise
④  elevate
【单选题】 Alice had a dream of becoming a biologist at a very young age and her ( ) paid off.
①  possess
②  prevail
③  positive
④  persistence
【单选题】 His CD player is beeping, for the battery is ( ).
①  runnig low
②  failing to
③  lacking of
④  short of
【单选题】 My teachers words ( ) me a lot in my decision making.
①  assured
②  accomplished
③  confronte
④  influenced
【单选题】 I’m thinking of buying a computer. Can you ( ) a good make to me?
①  advise
②  recommend
③  propose
④  suggest
【单选题】 On the first day at work, he was ( ) with a difficult task.
①  focused
②  concentrated
③  confronted
④  possessed
【单选题】 They are encouraged to be brave, independent and to ( )the world on their own or with friends.
①  explorative
②  exploration
③  explorer
④  explore
【单选题】 The authors great work has had a profound ( ) on me.
①  effect
②  assurance
③  confidence
④  evidence