电动工具使用前，应检查确认电线、接地或接零完好；检查确认工具的金属外壳可靠接地(   )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69530' and id < 4505104 and id<>'4505104' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69530' and id > 4505104 and id<>'4505104' order by id asc limit 5