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钻井中常见的井下工程事故有哪几种？

答案

参考答案：⑴卡钻事故；⑵钻具事故；⑶钻头事故；⑷落物事故；⑸井喷及井喷失控事故；⑹顿钻事故；⑺卡电缆、卡仪器事故。

单项选择题

如果放弃现金折扣，在信用期内付款，放弃现金折扣成本的大小与（）。

A.折扣百分比的大小呈反方向变化

B.信用期的长短呈同方向变化

C.折扣百分比的大小，信用期的长短均呈同方向变化

D.折扣期的长短呈同方向变化
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填空题

Part 1


·Read thefollowingpassage, eight sentences have been removed from the article.
·Choose from the sentences A-H the one whichfits each gap.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
·Do not mark any letter twice.
The single, decisive factor that made it possible for mankind to settle in permanent communities was agriculture. (1) Once people could control the production of food and be assured of a reliable annual supple of it, their lives changed completely.
Fanning was a revolutionary discovery. (2) With more food available, more people could be fed. Populations therefore increased. The growing number of people available for more kinds of work led to the development of more complex social structures. (3)
Farming the world over has always relied upon a dependable water supply. For the earliest societies this meant rivers and streams or regular rainfall. (4) Later communities were able to develop by taking advantage of the rainy seasons.
All of the ancient civilizations probably developed in much the same way, in spite of regional and climatic differences. (5) Heavier pottery replaced animal-skin gourds as containers for food and liquids. Cloth could be woven from wool and flax. Permanent structures made of wood, brick, and stone could be erected.
The science of mathematics was an early outgrowth of agriculture. People studied the movements of the moon, the sun, and planets to calculate seasons. (6) With a calendar it was possible to calculate the arrival of each growing season. Measurement of land areas was necessary if property was to be a factor in farming and housekeeping. (7) All of the major ancient civilizations in Mesopotamia, Egypt, the Indus Valley, and China emerged in the 4th millennium BC. Historians still debate over which one emerged first. It may well have been the Middle East, in an area called the Fertile Crescent. This region stretches from the Nile River in Egypt northward along the coast of former Palestine, then eastward into Asia to include Mesopotami
  • a. (8) This kind of larming depended on the reproduction of seed, normally from grain crops.A. It not only made settlements possible and ultimately the building of cities but it also made available a reliable food supply.B. Later came measures of value as commodity and money exchange became common.C. In this area people settled along the riverbanks and practiced field agriculture.D. After farming was developed in the Middle East in about 6500 BC, people living in tribes or family units did not have to be on the move continually searching for food or herding their animals.E. As villages grew, the accumulation of more numerous and substantial goods became possible.F. With a food surplus, a community could support a variety of workers who were not farmers.G. The first great civilizations grow up along rivers.H. In doing so they created the first calendars.
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