系统运行时的电压是通过系统的(    )来控制。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id < 4498470 and id<>'4498470' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id > 4498470 and id<>'4498470' order by id asc limit 5