观察期内因某病死亡人数/同期该病患者数×100%为该病的()。
A.发病率
B.病死率
C.患病率
D.罹病率
E.死亡率
参考答案:B
Which one is directly from the external carotid artey( )
A.superior thyroid artery
B.inferior thyroid artery
C.middle meningeal artery
D.vertebral artery
E. internal thoracic artery
患有异食癖的儿童有可能缺乏的微量元素是()
A.铁
B.锌
C.碘
D.镁
E.锰