导致继发性子宫收缩乏力的最常见原因是（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30904' and id < 2486542 and id<>'2486542' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30904' and id > 2486542 and id<>'2486542' order by id asc limit 5