在电力系统稳态分析的标幺值计算中，通常预先指定(    )基准值。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id < 4498450 and id<>'4498450' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id > 4498450 and id<>'4498450' order by id asc limit 5