化学物质本身无毒或毒性较低,但在体内经过生物转化后,形成的代谢产物毒性比母体物质增大

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问题:

化学物质本身无毒或毒性较低,但在体内经过生物转化后,形成的代谢产物毒性比母体物质增大,称为()

A.氧化反应

B.生物转化

C.生物代谢

D.代谢活化

E.结合反应

考点:北京住院医师公共卫生学Ⅰ阶段卫生毒理学卫生毒理学题库
题型:单项选择题

I am one of those people who are terrible at saying no. I take on too many projects at once, and spend too much of my time doing things I’d rather not be doing. I get stuff done, but it’s not always the best I can do, or the best way I could spend my time.

That’s why my newest goal, both as a professional and a person, is to be a quitter.

Being a quitter isn’t being someone who gives up, who doesn’t see important things through to the end. I desire to be the opposite of that. The quitter I want to be is someone who gets out when there’s no value in what he’s doing, or when that value comes at the expense of something more important.

We get involved in something, realize we don’t want to be a part of it, but keep on going. We say “Well, I’ve already invested so much time in this, I might as well stick it out.” A friend of mine once told me, “I knew I was an adult when I could stop reading a book, even after getting 500 pages into it.” Odd though it sounds, we all tend to do this.

I propose the opposite: quit as often as possible, regardless of project status or time invested. If you’re reading a book, and don’t like it, stop reading. Cut your losses, realize that the smartest thing to do is stop before your losses grow even more, and quit. Instead of reading an entire book you hate, read half of a bad one and half of a good one. Isn’t that a better use of your time?

Step back for a second. Let’s learn how to say “no” at the beginning, or in the middle, and free up more of our time to do the things we’d like to be doing, and the things actually worth doing.

Saying no is hard, and admitting a mistaken yes is even harder. But if we do both, we’ll start to make sure that we’re spending our time creating value, rather than increasing our losses. Let’s be quitters together.

小题1:The author wants to be a quitter, because he/she        .

A.wishes to have more time for relaxation

B.hopes to improve his/her personality

C.expects to make more efficient use of his/her time

D.has found it hard to do several things at one time小题2:In what circumstances does the author suggest quitting is a good idea?

A.When you know a task cannot be finished.

B.When you feel tired and need a rest.

C.When you meet with difficulties along the way.

D.When you realize what you are doing is not worth the time.小题3:The message the author tries to convey is to        .

A.learn to say no

B.create more value

C.live your life to the fullest

D.stop doing many things at a time

题型:单项选择题

下列有关法律责任和法律制裁的表述不正确的是

A.刑事责任是违法者向国家承担的责任,可以是一种连带责任

B.民事责任的功能只能是救济当事人的权利,赔偿或者补偿当事人的损失

C.行政责任实行严格责任原则

D.国家赔偿责任的主体是国家机关

题型:单项选择题

系统进行资源分配和调度的独立单位是

A.进程

B.线程

C.中断程序

D.用户程序

题型:单项选择题

鸣天鼓

题型:单项选择题

患者,男,48岁。确诊慢性粒细胞白血病已2年半,服用白消安治疗效果较好。近期出现乏力,低热,鼻衄。检查:脾大肋缘下6cm,血红蛋白70g/L,外周血原始粒细胞比例大于20%。应首先考虑的是

A.脾功能亢进
B.慢粒急变
C.合并肺结核
D.骨髓抑制
E.急性溶血

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