题目内容
案情：郑某结婚后经常受其丈夫王某虐待和殴打，并且发现王某经常酒后持刀在邻里间寻衅滋事，受到邻里唾骂，经常劝说仍不改正。王某还扬言：郑如果离婚，就杀死郑某和郑某娘家的全家人，致使郑某不敢离婚。2004年10月14日凌晨3时许，王某酗酒后卡住郑某的脖子进行殴打。见郑某进行反抗，王某便从厨房拿出菜刀砍郑某，郑某闪身躲开，顺手从门后拿一挖镢把打在王某的头部，王某当即坐地，头部血流不止。此时，郑某问王某： “你酒劲醒后饶我不饶”王某回答： “看老子饶你不饶。”郑某遂从厨房找出塑料绳套在王某的颈部，将其勒至窒息，后惟恐其不死，又找来一节铁丝拧在王某的脖子上。尔后将王某的尸体拖至厨房后墙处用柴草等物掩盖。后邻居报案后，郑某被抓获。该案经A市公安局侦查终结后，于2005年2月6日，移送人民检察院审查起诉。2月16日，某检察人员开始对此案进行审查，并同时通知犯罪嫌疑人郑某有权委托辩护人辩护。郑某的父母早就去世，唯一的亲人就是自己的姑姑，但是郑某不愿意给姑姑增加负担，因此没有委托律师。鉴于此，A市人民检察院便指定了一名负有法律援助义务的胡律师为其辩护。在审查起诉过程中，胡律师提出要复印公安局制作的起诉意见书。人民检察院以案情需要保密为由予以拒绝。2月28日，该案由人民检察院提起公诉，移送A市人民法院。该法院决定于3月17日开庭审理，并于3月15日向辩护律师发出了开庭通知。但是认为胡律师从一开始就介入这个案件，因而没有向胡律师发送起诉状副本。开庭后，公诉人和律师进行了激烈辩论。3月29日，法院判决郑某有期徒刑一年，缓期执行一年。 根据以上案情，结合我国刑法和刑事诉讼法的有关规定，回答以下问题： 郑某的行为是否属于防卫过当应当如何定性并说明理由。
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