引起维生素缺乏的常见原因有哪些?
简述缺铁的三个阶段?
面神经颊支() ["A．出腮腺前缘行于咬肌筋膜深面","B．一般与腮腺导管平行","C．来自颞面干","D．损伤时口角歪斜","E．位于耳屏间切迹与鼻翼上缘的连线"]
颌下腺导管开口于() ["A．舌系带","B．舌下皱襞","C．颌舌沟","D．伞襞","E．舌下肉阜"]
口腔颌面颈部动脉来源于() ["A．颈内动脉","B．颈外动脉","C．锁骨下动脉","D．A+B","E．A+B+C"]
目前国内临床实验室进行血脂测定所要达到的技术目标是什么?
