试题与答案

—He isn't an excellent astronaut, is he?

题型:选择题

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....

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