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31. Làm sao để xác định chảy máu tiêu hóa trên:A. Đặt ống thông mũi dạ dàyB. Nội soi thực quản - dạ dày - tá tràngC. Hỏi tiền sử của viêm loét dạ dàyD. Phân tích tính chất của máu nôn ra
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