问题 问答题 简答题

半轴有什么用途?

答案

参考答案:

半轴是驱动轮(前轮)的驱动轴,即动力传动轴。叉车有时要求两个主动轮以不同的速度旋转。因此,左右两主动轮不能用同一根整体轴来连接驱动,而是两根半轴通过差速器的联系作用分别实现驱动。所以前桥的轴为两根半轴。半轴内端有键槽,与半轴齿轮的内键槽互相咬合,分别接受差速器传来的动力。外端有凸缘,与前轮轮毂用螺栓连接,驱动车轮转动。从半轴的用途可以出,半轴要承受很大的扭矩,迫使车轮旋转而使叉车行驶。

阅读理解

阅读理解。

     He's an old cobbler (修鞋匠) with a shop in the Marais, a historic area in Paris. When I took him my

shoes, he at first told me: "I haven't time. Take them to the other fellow on the main street ; he'll fix them

for you right away."

     But I'd had my eye on his shop for a long time. Just looking at his bench loaded with tools and pieces

of leather, I knew he was a skilled craftsman (手艺人). "No," I replied, "the other fellow can't do it well."

     "The other fellow" was one of those shopkeepers who fix shoes and make keys"while-U-wait"-without

knowing much about mending shoes or making keys. They work carelessly, and when they have finished

sewing back a sandal strap (鞋带) you might as well just throw away the pair.

     My man saw I wouldn't give in, and he smiled. He wiped his hands on his blue apron ( 围裙), looked

at my shoes, had me write my name on one shoe with a piece of chalk and said,"Come back in a week."

     I was about to leave when he took a pair of soft leather boots off a shelf.

     "See what I can do?"  he said with pride. "Only three of us in Paris can do this kind of work."

     When I got back out into the street, the world seemed brand-new to me. He was something out of an

ancient legend, this old craftsman with his way of speaking familiarly, his very strange, dusty felt hat, his

funny accent from who-knows-where and, above all, his pride in his craft.

     These are times when nothing is important but the bottom line, when you can do things any old way

as long as it"pays", when, in short, people look on work as a path to ever-increasing consumption (消费)

rather than a way to realize their own abilities. In such a period it is a rare comfort to find a cobbler who

gets his greatest satisfaction from pride in a job well done.

1. Which of the following is true about the old cobbler ?

A. He was equipped with the best repairing tools.

B. He was the only cobbler in the Marais.

C. He was proud of his skills.

D. He was a native Parisian.

2. The sentence "He was something out of an ancient legend." ( paragraph 7 ) implies that _____.

A. nowadays you can hardly find anyone like him

B. it was difficult to communicate with this man

C. the man was very strange

D. the man was too old

3. According to the author, many people work just to _____.

A. realize their abilities

B. gain happiness

C. make money

D. gain respect

4. This story wants to tell us that _____ .

A. craftsmen make a lot of money

B. whatever you do, do it well

C. craftsmen need self-respect

D. people are born equal

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