Australia has beautiful ______________. [ ]
A. beach
B. beachs
C. beaches
答案:C
APTT是反映()
A.外源凝血途径的试验
B.纤溶系统活性的试验
C.抗凝因子活性的试验
D.内源凝血途径的试验
E.血小板活化的试验