A:加热
B:加入硫酸溶液
C:加入氢氧化钠溶液
D:降温
—____.
中国人深知“户破堂危,唇亡齿寒”、“救邻自救”的道理,当朝鲜民主主义人民共和国请求中国政府派兵援助时,为了抗美援朝,保家卫国,中央政府便派谁为司令员率军队入朝作战( )
Jin Mao Tower has fire and life systems that allow people to save themselves rather than waiting for others to come to their r____.