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单选题 患者女性,52岁。间歇性上腹部疼痛10余年,每年秋冬季节好发,劳累后明显。常在进食后3小时左右疼痛,进食后缓解。近1个月患者上腹饱胀不适,疼痛于餐后加重,且有反复大量呕吐,呕吐后疼痛缓解,入院治疗。为明确病因,首选的辅助检查是

A、 胃液分析
B、 胃镜检查
C、 X线钡餐检查
D、 幽门螺杆菌检查
E、 大便隐血试验

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