确诊溃疡活动性出血的最可靠的方法是()
A.胃液分析
B.X线钡餐检查
C.大便隐血
D.急诊胃镜检查
E.血色素测定
参考答案:D
人工床层
for the free tickets,I would not have gone to the film so often.
A.If it is not
B.Were it not
C.Had it not been
D.If they were not