骶尾关节至坐骨结节间径中点的距离是（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25967' and id < 2178187 and id<>'2178187' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25967' and id > 2178187 and id<>'2178187' order by id asc limit 5