散发性甲低的病因有()
A.甲状腺不发育,发育不全或异位
B.甲状腺素合成障碍
C.孕妇饮食缺碘
D.促甲状腺激素缺乏
E.甲状腺或靶器官反应低下
参考答案:A, B, D, E
Webster his American Dictionary of the English Language, which first appeared in 1828.
A.is best known for
B.is most known for
C.is best known as
D.is most known as
在矫形牙弓扩展中,下列哪类患者要特别注意可能引起前牙开及下颌后荡()
A.低角患者
B.均角患者
C.高角患者
D.前牙深覆患者
E.牙列拥挤患者