组织严重破坏时，大量组织因子进入血液，可启动外源性凝血系统。
参考答案：对
( )是一种相对集中度的指标，它表明市场占有率与市场中由小企业到大企业的累计百分比之间的关系。
A．行业集中度B．产品差别化C．洛伦兹曲线D．进入壁垒
Although the novel isn't popular among adults, it ______ the youth, especially boys. [ ]
A. refers to
B. appeals to
C. results in
D. deals with
