【单选题】【消耗次数：1】
propranolol、nitroglycerin、硝苯地平治疗心绞痛的共同作用是（ ）
①
减慢心率
②
缩小心室容积
③
扩张冠脉
④
降低心肌氧耗量
⑤
抑制心肌收缩力
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