为了测取变压器的励磁参数，试验时应调节（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69442' and id < 4497091 and id<>'4497091' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69442' and id > 4497091 and id<>'4497091' order by id asc limit 5