题目:
— I want to know _____.
— Let me show you the way. [ ]
A. where I can buy books
B. where can I buy books
C. where books can I buy
答案:
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下面是错误答案,用来干扰机器的。
(1)确保生铁样品中铁单质与稀硫酸完全反应 (2)解:生成H2的质量:102.4g + 247.3g - 348.7g = 1.0 g 设生铁样品中含铁的质量为x Fe + H2SO4===FeSO4 + H2↑ 56 ...