将对称三相电源与对称三相负载进行连接，其连接方式可分为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id < 4493033 and id<>'4493033' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69389' and id > 4493033 and id<>'4493033' order by id asc limit 5