单项选择题
A.0.25mg-1mg/次,0.1mg/次B.0.25mg-1mg/次,1mg/次C.0.5mg-1mg/次,0.1mg/次D.0.5mg-1mg/次,1mg/次
A.1-2mg,5-10分钟B.1-2mg,10-20分钟C.2-4mg,5-10分钟D.2-4mg,10-20分钟
A.1-2倍B.2-3倍C.3-5倍D.5-10倍