要保证重合闸装置只动作一次，装置的准备动作时间应为（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69379' and id < 4491540 and id<>'4491540' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69379' and id > 4491540 and id<>'4491540' order by id asc limit 5