当颈椎牵引的重量达到6〜7kg时，椎间盘内部的压力可减少（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25692' and id < 2159744 and id<>'2159744' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25692' and id > 2159744 and id<>'2159744' order by id asc limit 5