问题 问答题 简答题

步进电动机控制系统中,电动机通过丝杠螺母带动执行部件运动:已知:步距角θ,脉冲数N,频率f,丝杠导程p,试求执行部件:位移量L=?移动速度V=?

答案

参考答案:

L=(θp/360°)N;V=(θp/360°)f

材料分析题

结合实际,探究实践:

2010年9月23日,中国国务院 * * 温 * * 在纽约联合国总部出席第65届联合国大会一般性辩论,发表题为《认识一个真实的中国》的讲话。

运用所学知识,探究回答下列问题:

【认识国情】温 * * 说,中国现代化走到今天,先进落后并存,新旧矛盾交织,面临诸多前所未有的挑战。中国仍然处于社会主义初级阶段,仍然属于发展中国家。这就是我们的基本国情,这就是一个真实的中国。

(1)你对划线部分是怎样理解和认识的?

________________________________________________________________________________

【郑重承诺】温 * * 说,中国在追求自身发展的进程中,将继续以促进人类的共同发展和繁荣为己任。中国将继续寻求和扩大同世界各国的利益交汇点。中国的发展,不会损害任何人,也不会威胁任何人。中国绝不走“国强必霸”的路子。

(2)不走“国强必霸”的路子表明中国致力于走什么样的道路?为什么?

________________________________________________________________________________

【走向未来】温 * * 说,一个和平发展的中国,一个充满活力的中国,一个敢于担当的中国,永远与世界同行。让我们携起手来,为世界的持久和平与繁荣而奋斗!

(3)就此你对当今中国在世界舞台的地位及作用有何评价?

________________________________________________________________________________

(4)为使“中国的声音”更响亮,为建设和谐世界作出更大的贡献,我们应怎样做?

________________________________________________________________________________

阅读理解

Win $ 50 in the Coolest Gadget of the Week

Look at what’s the coolest gadget (vote for a chance to win $ 50).

Cryo S: A Cool Netbook Cooler

Like the other devices of NZXT, the Cryo S was designed to provide a competitive advantage at PC gaming. It has two adjustable 120mm fans that provide powerful cooling.

The full post can be found on Trends Updates.

Starry Night Bed

Are you having trouble getting that good nights sleep that you’re needing? Well, not any more. Why not take a look at the Starry Night Bed? The Starry Night Bed is a great new invention which will revolutionize the way in which you sleep. Not only is this bed fashionable and comfortable but it’s also a gadget heaven. With this bed you get many added gadgets including anti-snore technology, movie projector with speakers, temperature control and many more.

The full post can be found on Tech Styling.

Fugoo—talking gadgets

Fugoo gets all your appliances(装置,设备) talking to each other so your alarm clock could first wake you up and then tell the coffee machine to start working  while checking traffic conditions online to tell you how long it will take you to get to work.

The full post can be found on Decide What to Buy.

Vote  What is this week's coolest gadget?

〇 A Cool Netbook Cooler

〇 Starry Night Bed

〇 Fugoo—talking gadgets

小题1:Where can you find the full post of the “Cryo S”?

A.Tech Styling.

B.Super Cool Pets.

C.Decide What to Buy.

D.Trends Updates.小题2:If you buy a Starry Night Bed, you can get all the following gadgets EXCEPT ___________.

A.temperature control

B.movie projector

C.adjustable fans

D.anti-snore technology小题3:From this passage, we learn that Fugoo can_________.

A.check traffic conditions

B.wake you up

C.take you to work

D.make coffee小题4:Where does this advertisement probably come from?

A.A magazine.

B.A website.

C.A newspaper.

D.A textbook.