三相发电机绕组换成三相四线制，测得三个相电压UA=UB=UC=220V，三个线电压UAB=380V，UBC=UCA=220V，这说明（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id < 4500058 and id<>'4500058' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69472' and id > 4500058 and id<>'4500058' order by id asc limit 5