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单选题 患者男性,63岁。心绞痛病史2年,1天前骑车上桥时又出现胸骨后压榨样疼痛,即原地休息,含服硝酸甘油3片无效,出冷汗,路人将患者送到急诊室。经心电图检查,诊断为急性前壁心肌梗死,转入CCU进行链激酶治疗。患者问护士链激酶治疗的作用是什么,护士的回答正确的是

A、 解除疼痛
B、 扩张冠状动脉
C、 抑制血小板的聚集
D、 防止冠状动脉内血栓形成
E、 溶解冠状动脉内血栓

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