当验明确已无电压后，应立即将检修的高压配电线路和设备接地并（   ）短路。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69528' and id < 4504928 and id<>'4504928' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69528' and id > 4504928 and id<>'4504928' order by id asc limit 5