最常见的腹外疝是()。
A.股疝
B.脐疝
C.切口疝
D.腹股沟斜疝
E.腹股沟直疝
参考答案:D
解析:[知识点] 腹外疝的概述
There are many books on the shelf. But only one of them is ______.[ ]
A. worth to read
B. worth being read
C. worthy of reading
D. worth reading
在液压同步提升系统中,提升架的作用()。
A.承受工作载荷
B.保持提升索具正确提升方向
C.方便工件就位
D.防止倾覆