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【单选题】
男,40岁,某蓄电池厂制造工,工龄20年,主诉阵发性腹部疼痛4小时。患者在发病前常有食欲不振、腹部隐痛、便秘等症状。检查腹软,脐有压痛,无反跳痛,血象检查白细胞数正常。为了明确诊断,最有价值的工作是( )A.
工作现场卫生学调查
B.
询问既往史
C.
实验室检查
D.
进一步明确职业接触史
E.
询问家族史
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