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...