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【单选题】
关于纤溶系统的作用，下列说法正确的是A.
纤溶系统与凝血系统几乎同时被激活而发挥作用
B.
血液凝固以后，纤溶系统才开始发挥作用
C.
出血性疾病完全由纤溶活性增强所致
D.
DIC在凝血激活的阶段即发生纤溶亢进
E.
血栓性疾病完全由纤溶活性减低所致
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