Don't worry, Mrs Black. There's_______ with your son. A. nothing serious B. something serious C. serious nothing D. serious something 答案:A提纯含有少量硝酸钡杂质的硝酸钾溶液,可以使用的方法为
[ ]
A.加入过量碳酸钠溶液,过滤,除去沉淀,溶液中补加适量硝酸
B.加入过量硫酸钾溶液时,过滤,除去沉淀,溶液中补加适量硝酸
C.加入过量硫酸钠溶液,过滤,除去沉淀,溶液中补加适量硝酸
D.加入过量碳酸钾溶液,过滤,除去沉淀,溶液中补加适量硝酸