诊断消化性溃疡最有价值的检查是（）
A.HP检测
B.胃液分析
C.血清促胃液素测定
D.X线钡餐检查
E.胃镜检查和黏膜活检
参考答案：E
A: Have you heard from Jim?
B: No, I haven’t.
The underlined part means”_______”.
A．Heard of the letter
B．received a letter from
C．written a letter from
D．heard about
外啮合齿轮泵齿轮数目为2～５个，以（）最常用。
