肾超声检査常用的频率是（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27182' and id < 2252163 and id<>'2252163' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27182' and id > 2252163 and id<>'2252163' order by id asc limit 5