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【单选题】
男性，30岁，上腹隐痛，与饮食有4年，此次突然上腹部剧痛，不敢深呼吸。体检：面色苍白，上腹部压痛明显，伴反跳痛及肌紧张，下腹轻度压痛，白细胞15×10 9 /L，中性粒细胞0.80，为明确诊断首先应（）A.
腹部立位平片
B.
急查血淀粉酶
C.
腹腔穿刺
D.
紧急钡餐透视
E.
紧急静脉胆道造影
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