当X线能发现骨质疏松时，骨密度己经下降（ ）。

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku where sourceid='25666' and id < 2157061 and id<>'2157061' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25666' and id > 2157061 and id<>'2157061' order by id asc limit 5