毕Ⅱ式胃大部切除,术后呕吐物含食物及大量胆汁的原因()。
A.吻合口梗阻
B.输出袢空肠梗阻
C.输入袢慢性不完全梗阻
D.输入袢急性完全梗阻
E.碱性反流性胃炎
参考答案:B
下列"结肠癌"的造影表现,哪项也可见于良性病变()
A.环堤
B.半月征
C.结肠壁局限性僵硬
D.苹果核征
E.充盈缺损
A vessel,which does not normally engage in towing operations,is towing a vessel in distress. She().
A.need not show the lights for a vessel engaged in towing,if it is impractical to do so
B.may show the lights for a vessel not under command
C.must show a yellow light above the stern light
D.must show the lights for a vessel towing