改变发电机机端电压进行调压，电压的调整范围是( )。（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id < 4495195 and id<>'4495195' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id > 4495195 and id<>'4495195' order by id asc limit 5