若企业基期同定成本为200万元，蕋期息税前利润为300万元，则经营杠杆系数为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25013' and id < 2129832 and id<>'2129832' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25013' and id > 2129832 and id<>'2129832' order by id asc limit 5