架空线路行波传播速度约为（）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32666' and id < 2598130 and id<>'2598130' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32666' and id > 2598130 and id<>'2598130' order by id asc limit 5