凝血时间是反映凝血状况的筛选试验,与下列哪项有关 ()
A.血小板数量
B.血小板功能
C.血浆凝血因子
D.血管壁的完整性
E.血管壁的收缩功能
参考答案:C
19□0000000≈20亿,□中最小应填[ ]
A.1
B.0
C.5
—Mum, I can't see any point in studying hard.
—Come on. dear,Years of hard study will surely in your future career.
A.make sure
B.pay off
C.bring back
D.pay back