若交流绕组的节距为y=4/5τ，则可以消除电枢电动势中（   ）次谐波。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id < 4497186 and id<>'4497186' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69444' and id > 4497186 and id<>'4497186' order by id asc limit 5