施工机具应定期进行维护、保养。施工机具的(   )部分应保持润滑。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69528' and id < 4504956 and id<>'4504956' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69528' and id > 4504956 and id<>'4504956' order by id asc limit 5