简述精斑的血型测定。
参考答案：
1.ABO血型测定
2.其他血型测定
The bus stop is twenty _____ walk from here. You needn't _____ a bus. [ ]
A. minute's, to take
B. minutes', to take
C. minutes', take
D. minute's, take
受伤24小时的膝关节开放性伤口，应采取
A．尿流突然中断B．排尿困难C．膀胱刺激征D．尿潴留E．黏膜恶性变
