-_____ was your trip?
-It was very nice.[ ]
A. What
B. Where
C. How
D. When
答案:C
上腹部手术后出现顽固性呃逆,首先应考虑的原因是
A.术后肠粘连B.腹膜后血肿压迫腹腔神经丛C.膈下感染D.粘连导致胃扭转
生物增氧