计算患病率时,其分子为特定时间内某病A.新发病例数  B.新旧病例数  C.受危人口

题型:单项选择题 A1型题

问题:

计算患病率时,其分子为特定时间内某病

A.新发病例数 

B.新旧病例数 

C.受危人口数 

D.旧病例数 

E.观察期内病例数

考点:广西临床住院医师规范化培训内科学内科学题库
题型:单项选择题 A1型题

2005年10月12日,“神舟六号飞船在“长征二号F”,使中国人再次邀游了太空(如图所示)。请你结合物理知识解释下列问题:

(l)火箭中的燃料和氧化剂是         (选填“固”“液”或“气”)态的,它是通过既       又加压的方法使气体液化的。

(2)火箭点燃后,尾部的火焰如果直接喷到发射台上,发射架要熔化。为了保护发射架,在发射台底建一个大水池,让火焰喷到水池中,这是利用了水汽化时要        ,使周围环境温度不致太高,我们看见火箭刚点燃时周围大量出现的“白气”是由于水先              形成的。请你也举出一个生产技术或生活中利用物态变化来调整环境温度的例子:_________________________

(3)飞船返回进入大气层时,由于和空气高速摩擦而使船体表面温度很高,为了防止烧坏飞船,科学家在飞船表面涂上一层特殊物质(又叫“烧蚀层”),这层物质在高温下        并且        (上面两空分别填两种物态变化名称)从而保证飞船温度不至于升得太高。

题型:单项选择题 A1型题

某同学在家中尝试验证平行四边形定则,他找到三条相同的橡皮筋(遵循胡克定律)和若干小重物,以及刻度尺、三角板、铅笔、细绳、白纸、钉子,设计了如下实验:将两条橡皮筋的一端分别固定在墙上的两个钉子A、B上,另一端是这二条橡皮筋连接,结点为O,将第三条橡皮筋的另一端通过细绳挂一重物。

①为完成实验,下述操作中必需的是          

a.测量细绳的长度; b.测量橡皮筋的原长;c.测量悬挂重物后橡皮筋的长度:d.记录悬挂重物后结点O的位置。

②钉子位置固定,若利用现有器材,改变条件再次验证实验,可采用的方法是               

题型:单项选择题 A1型题

阅读理解。

     In a world where comparisons happen non-stop, it is difficult to look outside yourself and to ever be

content with who you are. There's always someone who's a bit better. The only solution is to reach inside

and measure against what Warren Buffett calls your own inner yardstick. There is no more accurate measure

for comparison than who you were yesterday, last week or last decade, when you were at your best.

     Nothing useful ever comes from comparison to others. Either you see yourself as better than someone

and you get lazy, or you see someone else as better than you and you feel like all your hard work is for nothing.

It is a fool's game. None of us are inherently above or below the person next to us. We are who we are. Not

one of us is exactly alike. The only direct and honest comparison is within yourself. Everything else is apples

to oranges.

     My opinion is that you are only allowed to compare yourself to someone else if their life situation is the

same as your own. Good luck finding that match. And one thing is for sure. No matter how hard you work

and how dedicated you are, there will always be someone who can run a little faster, jump a little higher, score

a little better or look a little nicer m a swimsuit. And if there's not, you can bet someone is coming up fast

behind you. So how can you always win in life? Become your best competitor.

     The following are the reasons why you are your own best competitor.

     1. You will always be motivated.

     Having an image of your most recent past limits is the perfect thing to push you to the next level. If you

ran 7 flights of stairs yesterday, then do 8 today. Who cares if the guy next to you did 15? It doesn't make a

bit of difference. You are a more fit person today than you were yesterday. Your own progress is all you need.

     2. You will continuously be your personal best.

     If you commit to a slightly higher standard of yourself every day, you will always be at the top of your

game. And that game will only get better. But if for some reason you fall off your mark, you will always have

the past image of your best performance to show you what you're capable of. Once you've done it, you know

what's possible and then it's just a matter of doing it again.

1. Through the passage the writer advises the readers to ____.

A. avoid comparison with others

B. work much harder

C. pay attention to others' progress

D. make full use of motivation

2. If you want to achieve your best, according to the author, you should ____.

A. see yourself better than others

B. measure accurately

C. compare with yourself

D. be honest with yourself

3. Which of the following is certain to happen according to the author?

A. Finding someone else who is in the same life situation as you are.

B. Finding someone who runs faster and jumps higher than you.

C. Finding someone who is hiding right behind you.

D. Finding someone who almost always wins in their life.

4. What can help you up to higher level in your life according to the passage?

A. Comparing yourself with the guy next to you.

B. Thinking about your own progress.

C. Promising to play a game every day.

D. Thinking of your most recent past limits.

题型:单项选择题 A1型题

银联IC卡

题型:单项选择题 A1型题

悬浮于空气中的( )等微粒,统称为气溶胶。

A.粉尘

B.烟

C.蒸气

D.雾

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