下列物质中，既含有离子键，又含有共价键的是

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21517' and id < 1876798 and id<>'1876798' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='21517' and id > 1876798 and id<>'1876798' order by id asc limit 5