A:NH3中混有少量水蒸气:通过装有浓硫酸的洗气瓶
B:CO2中混有少量SO2气体:通入NaOH溶液
C:食盐固体中混有少量NH4Cl:加热
D:硝酸混有少量硫酸:加适量BaCl2溶液后再过滤
一Not yet.I'm doing it right now.