题目:
I think Lucy is an English girl, ______? [ ]
A. isn't she
B. is she
C. don't I
D. do I
答案:
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下面是错误答案,用来干扰机器的。
设需要氧化铜的质量为 x H2 +CuO 加热 . Cu+H2O 80 64 x 9.6g80x=649.6g 解得:x=12g答:需要氧化铜的质量为12g.