诊断原发性下肢深静脉瓣膜功能不全最可靠的检 查方法是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25456' and id < 2144791 and id<>'2144791' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25456' and id > 2144791 and id<>'2144791' order by id asc limit 5