二尖瓣前叶M型曲线，其EF段下降速度正常为（  ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27181' and id < 2251910 and id<>'2251910' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27181' and id > 2251910 and id<>'2251910' order by id asc limit 5