A:玩具制造业
B:微电子工业
C:石化工业
D:制糖工业
读“世界年平均气温图(部分)”和“世界年平均降水量图(部分)”,回答问题。
一定条件下硝酸铵受热分解的化学方程式为:5NH4NO3═2HNO3+4N2↑+9H2O,在反应中被氧化与被还原的氮原子数之比为( )
____(凝视,盯着看)at people is considered rude in Britain and young children will be scolded by their parents if they look too long at another person.