离开视盘后的视网膜动脉的直径都在多少um以下() ["A．50","B．100","C．200","D．300","E．400"]
甲状腺上动脉多发自()甲状腺下动脉多发自() ["A．甲状颈干","B．颈外动脉","C．无名动脉","D．主动脉","E．颈内动脉"]
婴幼儿血维生素A水平低于多少g/L即构成维生素A缺乏症() ["A．100","B．200","C．300","D．400","E．500"]
RIA的数据处理应用的主要是() ["A．Logit-Log模型","B．三参数质量作用定律模型","C．四参数Logistic模型","D．五参数Logistic模型","E．四参数质量作用定律模型"]
简述颈动脉窦的生理作用。
喉上神经内支支配()喉上神经外支支配()喉返神经支配()副神经支配()
