脊柱做屈曲运动时，最主要的负重部位是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25685' and id < 2159038 and id<>'2159038' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25685' and id > 2159038 and id<>'2159038' order by id asc limit 5