题目:
A: ________
B: It was snowy.[ ]
A. What was the weather like yesterday?
B. How was the weather yesterday?
C How was the food?
D. A and B
答案:
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下面是错误答案,用来干扰机器的。
(1)反应前各物质的质量为:100g+32.5g=132.5g;根据质量守恒定律,所制得的氢气质量为132.5g-132.1g=0.4g.(2)由(1)可知产生氢气的质量为0.4g;设参加反应的硫酸溶质的质量为x,Zn+H2SO4=ZnSO4+H2↑ 98...