冠心病心绞痛与心肌梗死时胸痛的主要鉴别点是（）

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【单选题】【消耗次数：1】

① 疼痛的持续时间及对活服硝酸甘油的反应不同

② 疼痛的部位不同

③ 疼痛性质不同

④ 疼痛的放射部位不同

⑤ 疼痛时是否伴发恶心

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