下列物质中，属于离子化合物的是 [     ]

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21516' and id < 1876680 and id<>'1876680' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21516' and id > 1876680 and id<>'1876680' order by id asc limit 5