【单选题】【消耗次数：1】
系统发生两相接地短路故障时，复合序网的连接方式为（ ）
①
正序、负序、零序并联
②
正序、负序并联、零序网开路
③
正序、零序并联、负序开路
④
零序、负序并联，正序开路
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