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单选题 赵先生,40岁,于饱餐、饮酒后突然发生中上腹持久剧烈疼痛,伴有反复恶心,呕吐出胆汁。体检:上腹部压痛,腹壁轻度紧张。测血清淀粉酶明显增高。以下哪项提示急性胰腺炎预后不良

A、 代谢性酸中毒
B、 代谢性碱中毒
C、 低钾血症
D、 低钙血症
E、 低镁血症

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