A:20℃时,向一杯接近饱和的KNO3溶液中不断加入KNO3晶体
B:将浓盐酸敞口放置在空气中
C:向氢氧化钠和硝酸钡的混合溶液中,逐滴滴加稀硫酸
D:等质量、等浓度的过氧化氢溶液的分解
My father's grandfather who was famous in my hometown ________ the hospital in 1923.
认为一切事物都有对立面,对立的双方能够相互转化的思想家是( )