工频耐压试验中，作为耐压试验的调压设备，一般只采用(  ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69489' and id < 4501333 and id<>'4501333' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69489' and id > 4501333 and id<>'4501333' order by id asc limit 5