NaCl固体中混有下列杂质时，可以利用加热的方法进行提纯的是(　　)

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19978' and id < 1738473 and id<>'1738473' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='19978' and id > 1738473 and id<>'1738473' order by id asc limit 5