下列哪项是引起胃食管反流的主要原因().
A.一过性食管下括约肌松弛
B.胃排空延迟
C.裂孔疝
D.腹水
E.呕吐
参考答案:A
Guangzhou was the second Chinese city_______ the right _______the Asian Games.
A.obtaining; to host
B.to obtain; hosted
C.to obtain; to host
D.obtaining; hosting
关于关节,哪项不正确()
A.是骨连结的方式
B.活动度很大
C.分直接连结和间接连结两种
D.直接连结两骨间无关节腔
E.滑膜关节有关节面、关节囊及并节腔