既治肝肾不足，目暗不明，又治胎动不安的药物是（）。 ["杜仲","巴戟天","狗脊","桑寄生","菟丝子"]
卫气是（） ["藏于肾中之气","积于胸中之气","吸入肺中之气","行于脉外之气","行于脉中之气"]
全小叶型肺气肿呈现（） ["呼吸道、肺泡囊和肺泡扩张","肺泡道、肺泡囊和肺泡扩张","两者均有","两者均无"]
在不影响整个项目完工时间的条件下，某项活动最迟开工与最早开工时间之差称之为（） ["作业时间","自由时差","总时差","工作时间"]
桩的直径应为根径的（） ["相同","1\/2","2\/3","1\/3","1\/4"]
直流燃烧器的分级配风和均等配风各有什么特点？
