单项选择题
A.0.5mg/(kg·d)B.1~2mg/(kg·d)C.3~5mg/(kg·d)D.8~10mg/(kg·d)
A.5分钟B.20分钟C.40分钟D.60分钟
A.1~3个月B.3~6个月C.6~12个月D.12~18个月