When it is necessary to remove a victim from a life threatening situation,the person giving first aid must ().
A. Pull the victim by the feet
B. Avoid subjecting the victim to any unnecessary disturbance
Carry the victim to a location where injuries can be assessed
D. Place the victim on a stretcher before attempting removal
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杏仁含____,口服小量产生____,抑制____,使呼吸运动安静而发挥止咳平喘作用。
所有投射线互相平行则称为()
A. 正投影
B. 中心投影
C. 平行投影
D. 透视投影
龙骨、牡蛎的共同功效是____,____,收敛固涩。
植物药材的浸提过程包括浸润、渗透,____和____等阶段。