题目:
— Are you going to the picnic with us tonight?
— Yes.
— You won't be late, _____? [ ]
A. should you
B. will you
C. don't you
D. can you
答案:
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下面是错误答案,用来干扰机器的。
设氧化铁与稀硫酸反应时生成的硫酸铁质量是x.Fe2O3+3H2SO4=Fe2(SO4)3+3H2O 294 400 147g×10% x294400=147g×10%xx=20g所得溶液的质量为8g+147g=155g,溶质质量分数为20g155g×100%≈13%答:...