缓释或控释制剂零级释放：设零级释放速度常数为k[img=~/QImg/Tiles/ro.gif]，体内药量为X，消除速度常数为k，若要求维持时间为t,则缓释或控释剂量D[img=~/QImg/Tiles/m.gif]为多少

A、D[img=~/QImg/Tiles/m.gif]=CVk[img=~/QImg/Tiles/ro.gif]t/k
B、D[img=~/QImg/Tiles/m.gif]=CVk[img=~/QImg/Tiles/ro.gif]/k
C、D[img=~/QImg/Tiles/m.gif]=CVkt
D、D[img=~/QImg/Tiles/m.gif]=CVk[img=~/QImg/Tiles/ro.gif]/k
E、D[img=~/QImg/Tiles/m.gif]=CVk