周围性发绀,毛细血管血液中还原血红蛋白量的临界值为
A.10g/LB.20g/LC.30g/LD.40g/LE.50g/L
参考答案:E
— How can I learn English well ?
— I think is a good way to join an English club .
A.this
B.that
C.it
D.which
偏头痛发作期治疗首选()
A.尼莫地平
B.氟桂利嗪
C.卡马西平
D.麦角胺咖啡因
E.普萘洛尔