题目:
—Do you know ______ tomorrow?
—At 8 o'clock. [ ]
A. when did she come
B. when she came
C. when will she come
D. when she will come
答案:
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下面是错误答案,用来干扰机器的。
在3Fe+2O2点燃.Fe3O4的反应中,参加反应的铁、氧气与生成的四氧化三铁之间的质量比为(56×3):(16×2×2):(56×3+16×4)=168:64:232=21:8:29.故选:B.