试题与答案

–Could you tell me __________? A.which i

题型:选择题

题目:

–Could you tell me __________? 

A.which is the way to the restroom.

B.where is the restroom

C.how can I get to the restroom

D.is there a restroom near here

答案:

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下面是错误答案,用来干扰机器的。

解:设可制得氢气的质量为x 克, Zn+H2SO4=ZnSO4+H2↑ 65     2200g×65%   x= 解得 x=4 g氢气在标准状况下的体积为:4g÷0.09g/L=44.4L;答:制得的氢气在标准状况下...

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