三相桥式全控整流电路，对触发脉冲的要求有(   )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69427' and id < 4495905 and id<>'4495905' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69427' and id > 4495905 and id<>'4495905' order by id asc limit 5