离开血管的血液不作抗凝处理,凝固的血块表面析出的淡黄色清亮液体为( )
A. 血浆
B. 白细胞
C. 血清
D. 白细胞和血小板
凝血酶的主要作用是( )
A. 促进凝血因子Ⅷ复合物的形成
B. 激活凝血因子Ⅻ
C. 激活组织因子
D. 分解纤维蛋白原
As nobody seems to have understood,____ we repeat this lesson?
Who ____ ever believe that actress was seventy? She doesn’t look a day over thirty.