安装在室外的落地配电变压器，四周应设置（  ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69531' and id < 4505118 and id<>'4505118' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69531' and id > 4505118 and id<>'4505118' order by id asc limit 5