手术时发现腹壁下动脉在疝囊颈外侧的是（）
A.腹股沟直疝
B.股疝
C.脐疝
D.腹股沟斜疝
E.白线疝
参考答案：A
—Could you tell me _____?
—Sure. Go straight head. [ ]
A. where I can get to Beijing
B. where can I get to Beijing
C. where I can get some stamps
简述群体行为的基本模式?
