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女性，35岁。恶心1天，呕吐鲜血及血块2次，黑便1次入院。否认有"胃病"史。有支气管扩张咯血史，近3天痰中带血。鉴别出血部位最可靠的方法是（）
A . 纤维胃镜检查
B . CT检查
C . 胃肠钡剂造影
D . 呕吐物pH测定
E . 粪便隐血
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