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当前学科：中西医结合执业医师
题目：
单选题
治疗心衰，血管扩张药的主要药理依据是（）。
A
降低血压，反射性兴奋交感神经
B
减轻心脏的前、后负荷
C
扩张冠脉，增加心肌供氧
D
减少心肌耗氧
E
降低心排血量
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