【单选题】【消耗次数:1】
某一材料的下列指标中为常数的是
密度
表观密度
导热系数
强度
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相关题目
【单选题】 某一材料的下列指标中为常数的是(  )。  
①  密度  
②  表观密度(容重)  
③  导热系数  
④  强度
【单选题】 某一材料的下列指标中为常数的是(???)。
①  密度??
②  表观密度(容重)
③  导热系数??
④  强度?
【单选题】 颗粒材料的密度为ρ,表观密度为ρ0,堆积密度为ρ0′,则存在下列关系 ( )。
①  ρ> ρ0′>ρ0
②  ρ> ρ0 >ρ0′
③  ρ0 >ρ>ρ0′
④  ρ0′>ρ>ρ0
【简答题】 材料的表观密度是指_____ 。
【单选题】 集料表观密度中的表观体积是指什么
①  集料的实体体积
②  集料的孔隙体积和实体体积
③  集料的闭口孔隙体积和实体体积
【判断题】 同一种材料,若其表观密度与密度差值越大,则其密实度越大
①  正确
②  错误
【判断题】 针叶树材强度较高,表观密度和涨缩变形较小。
①  正确
②  错误
【判断题】 针叶树材强度较高,表观密度和胀缩变形较小。
①  正确
②  错误
【单选题】 2、按表观密度为( )时称为重混凝土。
①  2900 kg/m3
②  1950kg/m3
③  1950~2 600 kg/m3
④  2600 kg/m3
【判断题】 表观密度是指材料在绝干状态下,单位体积的质量。
①  正确
②  错误
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【单选题】 After five hours’ drive, they reached ___________they thought was the place they’d been dreaming of.
①  that
②  where
③  which
④  what
【单选题】 Although only of __________ intelligence, he speaks four languages fluently.
①  average
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【单选题】 Computer classes must be __________ to every student of all grades, which will make them have a good command of the modern communication and learning tool.
①  accessible
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④  acceptable
【单选题】 Peter’s mother kept telling him that he should give up smoking, but _____ didn’t help.
①  he
②  which
③  she
④  it
【单选题】 Not until he went through real hardship the love we have for our families is important.
①  had he realized
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④  he had realized
【单选题】 —I knocked over my coffee cup. It went right over _____ keyboard.—You shouldn’t put drinks near _____ computer.
①  the; /
②  the; a
③  a; /
④  a; a
【单选题】 The letters for the boss __________ on his desk but he didnt read them until three days later.
①  were put
②  was put
③  put
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【单选题】 Someone called me up in the middle of the night, but they hung up _____ I could answer the phone.
①  as
②  since
③  until
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【单选题】 Is the hotel _____ offered you a job _____ you stayed the first time you arrived here?
①  which; where
②  the one; in which
③  where; that
④  the one that; which
【单选题】 —Have you heard about that fire in the market?—Yes, fortunately no one __________.
①  hurt
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