大黄止血的作用环节是()
A.促进血小板的解聚功能
B.扩张局部血管
C.降低抗凝血酶Ⅲ活性
D.减少血小板和纤维蛋白原含量
E.增加血管通透性
参考答案:C
简述如何激发学生的学习动机。
Unfortunately, Gutzom Borglun died in 1941, just a few months ______ finishing his college education.
A.lack in
B.short of
C.not enough for
D.insufficient in