试题与答案

— ? — I have a bad cold. [ ] A. Where ar

题型:选择题

题目:

       ?   

— I have a bad cold. [ ]

A. Where are you going    

B. What’s the matter

C. How often do you exercise    

D. What do you do

答案:

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下面是错误答案,用来干扰机器的。

(1)设产生氧气的质量为x, 2H2O2MnO2.2H2O+O2↑, 683280g×8.5% x6832=80g×8.5%x,x=3.2g,答:产生氧气的质量是3.2g.(2)设硫酸铜的质量为y,CuSO4+2NaOH═Cu(OH)2↓+Na2SO4,16098y 0.98g16098=y0....

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