关于消除半衰期的叙述错误的是（）
A.是血药浓度下降-半所需要的时间
B.一级动力学半衰期为0.693/Ke
C.一级动力学半衰期与浓度有关
D.符合零级动力学消除的药物，半衰期与体内药量有关
E.一次给药后，经5个半衰期；体内药物已基本消除
参考答案：C
解析：一级动力学是指血中药物消除速率与血药浓度成正比，血药浓度高，单位时间内消除的药量就多，反之消除就少，其半衰期等于0.693/Ke，由于Ke是一个常数，因此符合一级动力学消除的药物，其半衰期是一个常数，而与血药浓度无关，所以答案为C。
据短文内容，完成表格中所缺的信息。(10分) In the modern world, ads are everywhere! Some people think that ads are great. Others hate ads, saying that they make our cities and countryside look ugly. Some young people see more than 100 ads a day. It’s true that some ads can be very useful. For example, they can help you to compare two different products so that you can buy the one you really need. They can also help you save money. When prices are listed, you can go to the store with the lowest price. Ads also tell you when stores are having sales. However , some ads can be confusing(混肴的 ) or misleading（误导的）. Sometimes the words sound good but don’t really tell you anything about the quality of the product. At other times, the picture in an ad looks a lot better than the real thing. And you have to be careful. At times an ad can lead you to buy something you don’t need at all.
|