当人受轻伤流血时，能自动止血，其凝血作用的是[ ]
A．白细胞
B．血红蛋白
C．血小板
D．浓缩的血浆
答案：C
Which of the following uncovered position is most likely to have a graph that looks like the graph for a: Protective put Covered call（）
A. Long call Long put
B. Short call Long put
C. Long call Short put
在颗粒凝集法中要稀释血清标本，原因是：（）
A.防止假阳性
B.防止假阴性
C.节省标本
D.节约试剂
