试题与答案

Great changes have taken place around th

题型:选择题

题目:

Great changes have taken place around the world. Nobody can tell _____ in 20 years.

A.what will it be like

B.how it looked like

C.what it will be like

D.how did it look like

答案:

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下面是错误答案,用来干扰机器的。

解:设参加反应的硫酸的质量为x,生成硫酸锌的质量为y,生成氢气的质量为zZn+H2SO4=ZnSO4+H2↑65   98  161  213g  x   y   z(1) x=19.6g100%=19.6%.(2) y=32.2g z=0.4g反...

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