我国规定的雷电流的波前和波长时间分别为（    ）。  

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69491' and id < 4501658 and id<>'4501658' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69491' and id > 4501658 and id<>'4501658' order by id asc limit 5