在基坑周边设防护栏及警示牌，并安排专人巡视检查，体现了安全事故隐患的（ )原则。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25929' and id < 2176366 and id<>'2176366' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25929' and id > 2176366 and id<>'2176366' order by id asc limit 5