如果三相功率基准值为Sb、线电压基准值为Ub，则阻抗基准值为(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69458' and id < 4498235 and id<>'4498235' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69458' and id > 4498235 and id<>'4498235' order by id asc limit 5