根据短文内容及首字母提示在空白处填上适当的单词,使短文意思完整。 Airpla

题型:填空题

问题:

根据短文内容及首字母提示在空白处填上适当的单词,使短文意思完整。

        Airplanes are the newest kind of transportation. From early times, people tried to f     1    through the

sky like birds. About 100 years a     2     , someone took the first ride on an airplane. This ride lasted for less

than one m     3   . These first planes were very s     4    , too. Only one o     5    two people could fly in

them at one time.

        Today these p     6    are very big and fast. H     7    of people can travel in them at one time. W     8    

them, people can get f     9    one side of the United States to the other in less than one day. Traveling is very

  10   from the way it was 100 years ago.

1._____ 2._____ 3._____ 4._____  5._____

6._____ 7._____ 8._____ 9._____ 10._____

考点:科教类阅读
题型:填空题

废旧印刷电路板的回收利用可实现资源再生,并减少污染。废旧印刷电路板经粉碎分离,能得到非金属粉末和金属粉末 

(1)废旧印刷电路板中回收的铁是新型电池的使用材料,如制成LiFePO4电池,它可用于电动汽车。电池反应为:FePO4+Li LiFePO4,电池的正极材料是LiFePO4,负极材料是石墨,含Li+导电固体为电解质。放电时其正极反应方程式为:                                        

(2)用H2O2和H2SO4的混合溶液可溶出印刷电路板金属粉末中的铜。已知:

Cu(s)+2H(aq)=Cu2(aq)+H2(g) △H=64.39kJ·mol1

      2H2O2(l)=2H2O(l)+O2(g) △H=-196.46kJ·mol1

      H2(g)+1/2O2(g)=H2O(l)  △H=-285.84kJ·mol1

       则在H2SO4溶液中Cu 与H2O2反应生成Cu2和H2O的热化学方程式为:                 

(3)部分金属的回收需要氧化性很强的溶液,如金常用        的混合溶液溶解

(4)为了分离金属粉末常用到氰酸(HCN)溶液,HCN是一种有毒且较弱的酸,已知:常温下HCN的电离程度非常小,其Ka=6.2×10-10,0.1mol/L的NaCN的pH=11.1,0.1mol/L的NH4CN的pH=9.2,则浓度都是0.1mol/L的NaCN和NH4CN溶液中,CN-水解程度大小为:NaCN     NH4CN(填:>  = < ),理由是:                                  

题型:填空题

一物体浸在水中,有3/5体积露出水面,若放入某液体中刚好完全浸没,则ρ:ρ(  )

A.5:3

B.3:5

C.5:2

D.2:5

题型:填空题

低碳调质钢焊接应注意的基本问题是:要求在马氏体转变时的冷却速度不能太快,以免()裂纹产生。

A.热

B.冷

C.再热

D.层状撕裂

题型:填空题

资本结构

题型:填空题

如何树立良好的客户服务意识?()

A.以客户需求为导向

B.一切为了客户

C.对专业信息的及时需求

D.对价格的参与需求

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