问题 问答题 简答题

何谓冲动式汽轮机?何谓反动式汽轮机?

答案

参考答案:

如果蒸汽仅通过喷嘴进行膨胀作功,而在叶片上并不膨胀作功,只是依靠汽流对叶片的冲击力量而推动转子转动,这类汽轮机叫冲动式汽轮机。

如果蒸汽不仅在通过喷嘴时要膨胀作功,而且在叶片上继续膨胀作功,此时叶片上不仅受到由于因汽流冲击而引起的作用力,而且受到由于蒸汽在动叶片上膨胀加速而产生的巨大的反作用力,故这类汽轮机称为反动式汽轮机。

阅读理解

They’re WILD animals

By Ernst-Ulrich Franzen

March 11, 2010 (3) Comments

The story about the woman who lost some fingers while feeding a bear at a zoo in Manitowoc, after she ignored warnings and barriers(栅栏), reminded me of the story I heard about a couple who put their baby on the back of a wild horse in South Dakota to get a really cute picture. We all do silly things at times — no one is immune — but treating wild animals as lovely pets has to fall into a special category. Teddy bears and Disney movies aren’t actually representative of real bears.

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1. TosaLeft - Mar 11, 2010 10:46AM

Don’t you think that maybe, just maybe some alcohol was involved?

2. tk421 - Mar 11, 2010 11:09 AM

It was already approved that alcohol was involved. Stories that begin with a drunk person saying “Hey, I got an idea, watch this!” rarely end well.

3. Tristan Kloss - Mar 11, 2010 11:41 AM

Alcohol certainly isn’t involved when people decide to keep “pets” like chimpanzees, baby tigers, etc. Stupidity, definitely. Dogs are pets because of thousands of years of domestication. Even farm animals, which have been kept by humans for thousands of years as well, aren’t let in the house. So why keep animals that treat human contact with, at best, indifference(冷淡、不在乎) and, at worst, violence?

60.In Ernst-Ulrich Franzen’s opinion, the woman lost her fingers because ________.

A. the zoo keepers didn’t warn her of the danger       

B. she didn’t know the bear was a wild animal

C. she was somehow influenced by cartoon characters

D. she climbed over the barriers and angered the bear

61.TosaLeft thinks the wounded woman ________.

A. may have been drunk                                          B. may be a little stupid

C. was addicted to wine                                           D. fed wine to the bear

62.tk421 means a drunk person ________.

A. should be forbidden to enter the zoo                     B. usually gets himself into trouble

C. is often fond of making up stories                         D. usually likes to show himself off

63.What does Tristan Kloss think of people treating wild animals as pets?

A. Kind.                       B. Illegal.                                   C. Loving.                           D. Stupid.

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