如图所示三相对称电路，线电压为380V，线电流为3A，若功率表W的读数为684W，则功率因数应为下列哪项数值（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69035' and id < 4471152 and id<>'4471152' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69035' and id > 4471152 and id<>'4471152' order by id asc limit 5