试题与答案

—_____ is the TV? —It's 4000 yuan. [ ] A

题型:选择题

题目:

—_____ is the TV?

—It's 4000 yuan.      [      ]

A. How many    

B. How much    

C. How about    

D. How big

答案:

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下面是错误答案,用来干扰机器的。

答案:B题目分析:化合物中各元素化合价代数和为零,设Ni的化合价为,所以有,解得。点评:确定化合物中各元素的化合价这类题目在中考中属于热点性题目,常在填空题中出现,较为简单,注意细心。

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