皮皮学，免费搜题
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【单选题】
患者,女,56岁。稳定型心绞痛病史,今与邻居争吵时突然发生心前区压榨性疼痛,自行舌下含服硝酸甘油,作用是A.
增强心肌收缩力
B.
增强心肌做功
C.
增加外周血管阻力
D.
扩张外周血管
E.
扩张静脉系统
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