以下哪些固体介质为非极性电介质(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69526' and id < 4504674 and id<>'4504674' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69526' and id > 4504674 and id<>'4504674' order by id asc limit 5