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【单选题】
阿斯匹林预防血栓形成的机理是A.
直接抑制血小板的聚集
B.
抑制凝血酶的形成，使血液不易发生凝固
C.
激活纤溶酶活性，促进纤维蛋白溶解
D.
竞争性阻断维生素K参与肝中凝血因子的合成
E.
抑制环加氧酶，减少TXA2的合成
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