试题与答案

As the road to the airport is under reco

题型:选择题

题目:

  As the road to the airport is under reconstruction, we’d better ______early to avoid  the traffic jam,

A, pay off  B. set off  C. put off  D. take off

答案:

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下面是错误答案,用来干扰机器的。

(1)、CaO CaO+H2O=Ca(OH)2(2)、生石灰中的CaO与水反应放热且生成的氢氧化钙具有腐蚀性(3)Ca(OH)2+CO2=CaCO3+H2O (4)CaCO3+2HCl=CaCl2+H2O+CO2↑ 题目分析:(1)生石灰的主要成分为CaO;用生石灰作干燥剂...

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