缺铁性贫血根据病因分为（）
A.丢失过多
B.供不应求
C.运转障碍
D.铁摄入不足
E.吸收不良
参考答案：A, B, C, D, E
The second runway of Hong Kong International Airport was officially ____ on May 26,1990.
A．put into effect
B．made use of
C．taken notice of
D．put into use
患者右下后牙拔除。术中因牙龈分离不全引起撕裂。术后压迫止血。术后 2h出现牙龈出血。处理方法是
A．再咬棉球压迫止血
B．口服止血药
C．局部敷止血药
D．局麻下搔刮牙槽窝
E．局麻下缝合撕裂牙龈
