【单选题】【消耗次数：1】
患者3个月来因体力活动诱发左前胸及胸骨后压榨样疼痛，并向左肩放散，停止活动后3～5min疼痛逐渐缓解，最可能是
①
变异型心绞痛
②
稳定型心绞痛
③
主动脉瘤
④
不稳定型心绞痛
⑤
胸肌劳损
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对于稳定型心绞痛说法恰当的是（）
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近3个月内劳力诱发的心绞痛的频率和程度加重，对硝酸甘油的需求增加
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心绞痛发作与体力活动2无关，可出现短暂ST段抬高
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劳累和休息时均可出现心绞痛
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胸痛多在夜间发作
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含硝酸甘油5分钟内疼痛消失
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持续左前胸憋闷感
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疼痛时心电图示ST段抬高
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胸痛发作多在15分钟以上
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心绞痛疼痛重，持续30分钟以上
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