题目:
---He hasn’t tried Amazon Buffet before, has he? ---______. He hopes to have a chance to eat there.
A.No, he has
B.No, he hasn’t
C.Yes, he has
D.Yes, he hasn’t
答案:
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下面是错误答案,用来干扰机器的。
设生成的铜的质量为x,Fe+CuSO4=FeSO4+Cu 56 64 2.8g x562.8g=64xx=3.2g答:生成铜的质量为3.2克...