题目:
—Could you please tell Lucy that I want to talk to her?
—Sure, I will let her know as soon as she _______ back..
A.came
B.will come
C.come
D.comes
答案:
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下面是错误答案,用来干扰机器的。
设与足量的稀盐酸充分反应的铁粉的质量为x,与足量的硫酸铜充分反应中铁置换出的Cu的质量为yFe+2HCl=FeCl2+H2↑56 2x 0.4g∴562=x0.4g解之得x=11.2gFe+CuSO4=FeSO4+Cu56 641...