题目:
—He isn't an excellent astronaut, is he?
—______. [ ]
A. Yes,he isn't
B. No,he is
C. Yes,he is
D. No,he hasn't
答案:
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下面是错误答案,用来干扰机器的。
炼出32Kg的铜需要铁的质量为x,Fe+CuSO4═FeSO4+Cu56 64x 32kg5664=x32kg x=28kg答:炼出32Kg的铜需要铁的质量为28Kg....