题目:
After a long hiking, the boy was ________ tired to walk. [ ]
A. too
B. to
C. so
D. very
答案:
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答案:A题目分析:硝酸铵(NH4NO3)中铵根显+1价,设铵根中氮元素的化合价是x,根据在原子团中正负化合价代数和为原子团的化合价,可得:x+(+1)×4=+1,则x=﹣3价.硝酸铵(NH4NO3)中硝酸根显﹣1价,设硝酸根...