下列电介质中属于离子结构的是（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32601' and id < 2592299 and id<>'2592299' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32601' and id > 2592299 and id<>'2592299' order by id asc limit 5