经典的凝血瀑布学说认为内源性凝血途径的启动因子是（）
A.PK
B.因子Ⅻ
C.因子Ⅶ
D.TF
E.因子Ⅴ
参考答案：B
He usually ____ grasshoppers in the park. But now he is a kite in the park. [ ]
A. catch; fly
B.catching; fly
C.catches; flying
体表最容易摸到股动脉的部位在
A．腹股沟韧带外、中1/3交点处
B．腹股沟中点稍下方
C．腹股沟韧带中、内1/3交点处
D．腹股沟中点稍内侧
E．腹股沟中点稍外侧
