与平均软组织声速差别过大，可引起的测量误差或伪像。比较容易发生在（     ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25727' and id < 2162929 and id<>'2162929' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25727' and id > 2162929 and id<>'2162929' order by id asc limit 5