A.膽骨化醇 B.25-羥膽骨化醇 C.1,25-二羥膽骨化醇 D.24,25-二羥膽骨化醇 E.以上都不是
A.0.5~1mg/d B.1~2mg/d C.2~3mg/d D.3~4mg/d E.4~5mg/d