A:Na2CO3═2Na++CO32﹣
B:H2SO4═2H++SO42﹣
C:NaHCO3═Na++H++CO32﹣
D:NaHSO4═Na++H++SO42﹣
石家庄某市的最高气温是1℃,最低气温是﹣3℃,该天的温差是( )
I'm very happy to ____ my friend in Australia.(hear)
I couldn't do it _________ your great help. Thanks a lot!