急性糜烂性胃炎的确诊应依据()
A.上消化道出血的临床表现
B.胃液分析
C.X线胃肠钡餐检查
D.急诊胃镜检查
E.腹部B超
参考答案:D
In our class _____ of the students _____boys.
A.third fifths; is
B.third fifth; are
C.three fifth; is
D.three fifths; are
如图所示两个轻质薄容器的底面积相等,在容器中倒入高度相同的水,则容器底部受到水的压力Fa______Fb,受到水的压强pa______pb,容器对水平面的压强p′a______p′b(均选填“>”、“=”或“<”)