容易滑动、滚动的工具、材料要堆放在脚手架上，必须（）措施防坠落。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25789' and id < 2166661 and id<>'2166661' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25789' and id > 2166661 and id<>'2166661' order by id asc limit 5