有NaCl、FeCl 2、FeCl 3、MgCl 2、CuCl 2、AlCl 3、NH 4Cl六种溶液, 只用一种试剂就可以把它们鉴别开来，该试剂是

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21604' and id < 1880532 and id<>'1880532' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21604' and id > 1880532 and id<>'1880532' order by id asc limit 5