电梯井口除设置固定的栅门外，还应在电梯井内每隔（ ）层设一道安全平网。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='24590' and id < 2110394 and id<>'2110394' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='24590' and id > 2110394 and id<>'2110394' order by id asc limit 5