硫酸镁治疗有效浓度为
A．不完全流产B．稽留流产C．难免流产D．先兆流产E．完全流产
参考答案：B
Now many teenagers can see ________ than the old people do because they watch TV for a long time.
A. better B. no longer C. no better
踝管综合征的诊断依据是（）
A.踝关节内外侧肿胀
B.外踝部蚁行感
C.跟骨内侧和足底麻木疼痛感
D.轻叩内踝后方，足部针刺和痛感加剧
E.踝关节活动严重受限
