下列哪项腹外疝最易发生嵌顿：
A．腹股沟斜疝
B．腹股沟直疝
C．股疝
D．切口疝
E．脐疝
参考答案：C
When he turned professional at the age of 11，Mike________to become a world champion by his coach and parents.
A．expected
B．was expecting
C．was expected
D．would he expected
乙烯干燥器的运行周期一般为（）。
A．6小时
B．24小时
C．72小时
D．168小时
