进行直流高压试验时，对直流试验电压的要求包括（    ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69489' and id < 4501338 and id<>'4501338' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69489' and id > 4501338 and id<>'4501338' order by id asc limit 5