单室模型血管外重复给药蓄积系数公式（）
A.
B.
C.
D.
E.
参考答案：E
解析：蓄积系数用R表示，平均滞留时间用MRT表示，所以选EC。
Most men don't cry ______, but they sometimes cry when they are alone.[ ]
A. in public
B. on purpose
C. by accident
D. in peace
Pearl's bright clothes always make her _____ in a crowd.[ ]
A. light up
B. call up
C. send out
D. stand out
