问题 问答题 简答题

在哪些情况下。导线损伤可做表面处理?

答案

参考答案:

导线在同一截面处的损伤同时符合下列两种情况时,可做表面处理:

(1)铝、铝合金单股损伤深度小于单股直径的1/2;

(2)钢芯铝绞线及钢芯、铝合金绞线损伤截面积为导电部分截面积的5%及以下且强度损失小于4%;

(3)单金属绞线损伤截面积为4%及以下。

阅读理解

More than 10 years ago, it was difficult to buy a tasty pineapple (菠萝). 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 (营养) it was all good news too. This nice tasting pineapple contained four times more vitamin C(维生素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 the market.

介绍一种产于夏威夷的可口的、营养丰富的菠萝。

60. We learn from the text that the new type at 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

61. 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.

62. 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

63. 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

单项选择题