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....