三相变压器组不宜采用 Yyn0 联结，主要是因为（  ）？（0.5）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id < 4495225 and id<>'4495225' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69423' and id > 4495225 and id<>'4495225' order by id asc limit 5