无压隧洞多采用()断面。
参考答案:圆拱直墙形
---Did Tom win the 200-meter race at our sports meet?
---Of course not. I’m a poor runner and he did _______ than I.
A.as well as
B.no better
C.no worse
D.not better
女性,38岁,反复发作吞咽困难10余年,钡剂造影发现食管下端呈鸟嘴样狭窄,食管体部增宽达5cm。
首要诊断是()。
A.食管癌
B.贲门失弛缓症
C.食管化学烧伤
D.食管炎
E.先天性巨食管