关于慢性胃炎的治疗正确的是()。
A.幽门螺杆菌感染引起者应予根治
B.B型胃炎可予醋类酸性饮食
C.中度异型增生宜行手术治疗
D.避免刺激性饮食
E.对症处理
参考答案:A, D, E
Speaker A: Excuse me, could you tell me how to get to the railway station Speaker B: ()。
A. Yes, of course I can.
B. Well, you’d better not ask a stranger.
C. Sorry. I’m a stranger here myself.
D. Yes, you can take a taxi. It’s more expensive, but it’s quicker.
当光从光密介质向光疏介质传播时,在下列哪种情况下必定出现临界角:().
A.入射线与法线一致
B.入射线与界面呈45°
C.折射线沿分界面通过
D.折射线与法线所构成的角度等于入射角