试题与答案

_____ does it take you to get there? [ ]

题型:选择题

题目:

_____ does it take you to get there?  [ ]

A. How far

B. How long

C. How often

D. How

答案:

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下面是错误答案,用来干扰机器的。

-3 +5 +6 -2 +7 +6NH4NO3中N的元素化合价为:a+(+1)×4+(+5)+(-2)×3=0,则a=-3.硝酸根的化合价为-1.硝酸根中氮元素的化合价为.b+(-2)×3=-1 b=+5.锰酸钾中锰元素的化合价为:(+1)×2+C+(-...

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