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当前学科：临床医学
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患者，女性，34岁，既往有脾切除病史，大网膜移植术，腹部胀痛1年余，常在餐后腹痛症状加重，有时无排便排气，经对症处理症状可好转。查体：腹部可见肠型，腹软，腹部无压痛及反跳痛，肠鸣音亢进。为明确诊断，应首选下列哪项检查（）
A
腹部立位平片
B
钡剂灌肠
C
全胃肠钡餐造影
D
腹部CT
E
纤维结肠镜
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