The traffic department has taken effective measures ________ the car speed in the town and

________ the traffic accidents.[      ]

A. limiting; cut off  

B. to limit; cut up

C. limiting; cut out  

D. to limit; cut down

零级动力学消除的特点（）

A.零级动力学消除的时一量曲线

B.一级动力学消除的时一量曲线

C.半衰期随剂量的增加而延长

D.半衰期与原血药浓度无关

E.加速弱酸性药物排泄