患者，男，50岁。在喷洒农药时不慎接触皮肤，3小时后接触农药部位出现过敏性皮炎，伴头痛，恶心呕吐，多汗，视物不清，紧急入院治疗，査体见瞳孔缩小，呼气有刺激性蒜味，査全血胆碱酯酶活力60%，诊为急性有机憐杀虫药中毒。其中毒程度为

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