铆接头的连接板厚度t＝d，则铆钉切应力τ＝（），挤压应力σbs＝（）。

关于复合固定桥，下列哪一点是错误的（）

A．含有两个以上基牙

B．基牙数目多而分散，获得共同就位道较难

C．有两种或三种基本类型的固定桥组合

D．常含有四个或四个以上的牙单位

E．当承受力时，各个基牙的受力反应基本一致

根据我国宪法规定，中华人民共和国保护海外归侨的（）。

A．正当的权利和利益

B．合法的权利和利益

C．权利和自由

D．权益和自由

（四）在2004年我国举办的国际旅游展销会上，根据双方的意愿，HB国际旅行社同韩国交通公社的代表举行了洽谈，并签订了合同。根据合同，韩方将于2005年4月组织第一个旅游团来访。此后，双方通过各种联络方式就该团的人数、在华天数、旅游路线和价格等进行了具体磋商。

目前，我国的旅行社同海外客房进行业务联系的方式主要是（　）。

A．电传

B．电报

C．电话

D．传真

E．电子邮件

阅读理解。

     I'm one of those people who are terrible at saying no. I spend too much of my time doing things I'd

rather not be. I get things done, but it's not always the best I can do, or the best way I can 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 want to quit doing things that I'm asked to do. for no other reason than I'm asked to do it. I want to be

able to quit something in mid-stream, because I realize there's nothing good coming from it.

     A friend of mine once told me that"I knew I was an adult when I could stop reading a book, even after

getting 500 pages into it."Strange though it sounds,we all intend to do this. We get involved in something,

realize we don't want to be a part of it, but just keep doing it.

     What I advise is to quit as often as possible. If you're stuck doing something, and don't really want to

do it anymore, step back for a second. Ask if you really have to do this, and what value is being produced

from your doing it. Don't think about the time you've put into it or how much it's taken over your life. If

you don't want to do it,and don't have to do it, don't do it.

     By quitting these things, you'll free up time to do things that actually do create value, for yourself and

for others.You'11 be able to begin to put your time and effort into the things you'd actually like to do.

     Let's learn how to say"no" at the beginning. or in the middle. Let's see to it that we're spending our time

creating value, rather than worsening our losses. Let's be quitters together. 

1. From the underlined sentence in Paragraph 3,we can see the friend of the writer seems to believe _____.

A. adults should always finish books completely

B. adults should stop reading after getting 500 pages

C. adults can stop reading if there's no value

D. adults can stop reading if he gets the main idea

2. The underlined phrase "free up time" in Paragraph 5 probably means "_____ ".

A. give somebody extra time

B. make bad use of time

C. takes somebody more time

D. spend less time

3.The best title of the passage should be _____.

A. Stop Doing Things

B. Try to Be a Quitter

C. Learn to Say No

D. Create our Value

洗胃的目的是( )

A．清除胃内毒物

B．将胃内滞留食物洗出

C．减轻胃黏膜水肿

D．减轻炎症

E．某些手术前的准备