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【多选题】
临床上硝酸甘油与普萘洛尔常合用于心绞痛是因为A.
协同降低心肌耗氧量
B.
两药均可扩张冠状动脉
C.
普萘洛尔可取消硝酸甘油引起的心率加快
D.
硝酸甘油可缩小普萘洛尔引起的心室容积扩大
E.
普萘洛尔收缩外血管作用可被硝酸甘油取消
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