血管内超声探头，常用频率是（     ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25727' and id < 2162906 and id<>'2162906' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25727' and id > 2162906 and id<>'2162906' order by id asc limit 5