()、()属于Ⅱ区。
参考答案:正常运行时不出现,即使出现也只是短时间偶然再现爆炸性气体;蒸气或薄雾的区域
We were pretty _____ when we learned the _______ fact that an elephant would come to live in our school.
A.amazing, amazing
B.amazed, amazed
C.amazing, amazed
D.amazed, amazing
男,35岁,反复上腹痛3年,近两个月加重,常夜间痛,曾有黑便史。
为明确诊断,应选择下列哪项检查()
A.胃镜
B.C呼气试验
C.上消化道造影
D.腹部CT
E.血清胃泌素测定