肾结石不如胆襄结石易于被超声检查发现的主要原因是（     ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25749' and id < 2163776 and id<>'2163776' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25749' and id > 2163776 and id<>'2163776' order by id asc limit 5