问题 问答题 论述题

试述金刚石钻进的优越性

答案

参考答案:金刚石钻进有以下优点:

(1)孔径小,回次进尺长,辅助工作少,可采用不起钻取芯方法,故工效高。

(2)取芯率高,岩芯的完整度好,表面光滑,便于地质观察。

(3)钻具与孔壁的间隙小,钻孔的弯曲度小,孔内事故少。

(4)虽然金刚石钻头的造价较高,但由于工效大幅度提高,其他材料消耗和人工费降低,施工成本反而降低。

(5)设备、钻具轻,劳动强度相对较低。

阅读理解

Reading Comprehension

  Most British telephone cards are just plain green, but card collecting is becoming a popular hobby in

Britain and collectors even have their own magazine, International Telephone Cards. One reason for

their interest is that cards from around the world come in a wide variety of different and often very

attractive designs. There are 100,000 different cards in Japan alone, and there you can put your own

design onto a blank card simply by using a photograph or a business card.

  The first telephone cards, produced in 1976, were Italian. Five years later the first British card

appeared, and now you can buy cards in more than a hundred countries. People usually start collecting

cards because they are small and light and you do not need much space for them. It is also a cheap hobby

for beginners, although for some people it becomes a serious business. In Paris, for example, there is a

market where you can only buy telephone cards, and some French cards cost up to ? 4,000. The first

Japanese card has a value of about ? 28,000. Most people only see cards with prices like these in their

collectors' magazine.

1. The first card for public telephones was _____.

A. British

B. Italian

C. French

D. Japanese

2. Why do people usually begin to collect cards? Because _____.

A. they don't take up much space

B. they have special and attractive designs

C. it's a popular hobby

D. they have a great value

3. Which statement is not true?  

A. A lot of British people collect telephone cards.

B. Some cards cost a lot of money.

C. It's easy to keep your cards at home.

D. You need a lot of money when you start collecting cards.

4. What is the best title for the passage? 

A. The design of calling cards.

B. The value of calling cards.

C. The market of calling cards.

D. The collecting of calling cards.

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