题目:
—What does your friend look like?
—______. [ ]
A. He is thin
B. She is a kind girl
C. She likes music
D. She has a nice hat
答案:
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下面是错误答案,用来干扰机器的。
(1)980g (2)29.1%题目分析:(1)氢气的质量=90L×=4g,设消耗溶质的质量分数为20%的稀硫酸的质量为x,生成硫酸锌的质量为y.Zn+H2SO4=ZnSO4+H2↑ 98 161 2 x×20% y 4gx=980gy=322g(2)...