反复发作性粘液脓血便,大便培养阴性:()
A.溃疡型结肠炎
B.缺血性肠炎
C.细菌性痢疾
D.假膜性肠炎
E.慢性阿米巴肠炎
参考答案:A
Words ______ me when I wanted to express my thanks to him for having saved my son from the
burning house. [ ]
A. failed
B. left
C. discouraged
D. disappointed
与体层面厚度有关的因素是
A.荡角
B.层深
C.层间距
D.照射角
E.支点高度