问题 问答题 简答题

试述短行程制动器的调整部位及调整方法。

答案

参考答案:

(1)调整电磁铁衔铁冲程。用一扳手卡住制动杆方头,另一扳手紧固螺母,即可减小冲程。反之,松开螺母即可增大冲程。

(2)调整主弹簧的张力。用一扳手卡弹簧,螺母,另一扳手拧动制动杆,拧紧螺杆(顺时针转动螺杆)时主弹簧张力增大,反之,主弹簧张力减小,通常将螺母拧紧到拉板刻度线处为止。

(3)调整瓦块与制动轮的间隙。拧紧调节螺栓,则瓦块与制动轮的间隙减小,松开调节螺栓,则间隙增大。

单项选择题
阅读理解

More than 10 years ago, it was difficult to buy a tasty pineapple. The fruits that made it to the UK were green on the outside and, more often than not, hard with an unpleasant taste within. Then in 1966, the Del Monte Gold pineapple produced in Hawaii first hit our shelves.

The new type of pineapple looked more yellowy-gold than green. It was slightly softer on the outside and had a lot of juice inside. But the most important thing about this new type of pineapple was that it was twice as sweet as the hit-and-miss pineapples we had known. In no time, the Del Monte Gold took the market by storm, rapidly becoming the world’s best-selling pineapple variety, and delivering natural levels of sweetness in the mouth, up until then only found in tinned pineapple.

In nutrition it was all good news too. This nice tasting pineapple contained four times more vitamin C than the old green variety. Nutritionists said that it was not only full of vitamins, but also good against some diseases. People were understandably eager to be able to buy this wonderful fruit. The new type of pineapple was selling fast, and the Del Monte Gold pineapple rapidly became a fixture in the shopping basket of the healthy eater.

Seeing the growing market for its winning pineapple, Del Monte tried to keep market to itself. But other fruit companies developed similar pineapples. Del Monte turned to law for help, but failed. Those companies argued successfully that Del Monte’s attempts to keep the golden pineapple for itself were just a way to knock them out of the market.

小题1:We learn from the text that the new type of pineapple is __________.

A.green outside and sweet inside

B. good-looking outside and soft inside

C.yellowy-gold outside and hard inside

D.a little soft outside and sweet inside小题2:Why was the new type of pineapple selling well?

A.It was rich in nutrition and tasted nice.

B.It was less sweet and good for health.

C.It was developed by Del Monte.

D.It was used as medicine.小题3:The underlined word “fixture” in Paragraph 3 probably refers to something _________.

A.that people enjoy eating

B.that is always present

C.that is difficult to get

D.that people use as a gift小题4: We learn from the last paragraph that Del Monte _________.

A.slowed other companies to develop pineapples

B.succeeded in keeping the pineapple for itself

C.tried hard to control the pineapple market

D.planned to help the other companies