A:用图1所示装置除去Cl2中含有的少量HCl
B:用图2所示装置蒸干NH4Cl饱和溶液制备NH4Cl晶体
C:用图3所示装置制取少量纯净的CO2气体
D:用图4所示装置分离CCl4萃取碘水后已分层的有机层和水层
Hello ! My name is LiQiang . There are four people in my family . My father is a worker . My mother is a farmer . My little sister is a pupil. I am a pupil , too . We are in the same school .
如果水位升高1米记为+1米,那么水位下降2米应记为( )
等物质的量浓度的下列五种溶液:①CH3COOH ②(NH4)2CO3③NaHSO4 ④Ba(OH)2,溶液中水的电离程度由大到小排列是( )