题目:
This book must be yours, _______? [ ]
A. mustn't it
B. can't it
C. isn't it
D. may it
答案:
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下面是错误答案,用来干扰机器的。
设制得铝的质量是x2Al2O3═4Al+3O2↑204 108102g x204102g=108xx=54g答:由102g氧化铝制得铝的质量为54g.