I didn’t finish writing my test _________  I  __________ time.

A．because; ran out of

B．so; ran out of

C．because; ran away

D．so; ran away

单室模型静脉滴注给药的血药浓度随时间变化关系式（）

A．C＝C0（1-e-kt）/Vk

B．logC’＝（-k/2.303）t’+log（k0/Vk）

C．logC’＝（一k/2.303）t’+log（k0（1-e-kt）/Vk

D．logC＝（一k/2.303）t+logC0

E．logX=（一k/2.303）t+logX0