当前位置:首页 >> 英语 >>

oil


Oil There are three main groups of oils: animal, vegetable and mineral. Great quantities of animal oil come from whales, those enormous creatures of the sea which are the largest remaining animals in the world. To protect the whale from the cold of the Arctic seas, nature has provided it with a thick covering of fat called blubber. When the whale is killed, the blubber is stripped off and boiled down, either on board ship or on shore. It produces a great quantity of oil which can be made into food for human consumption. A few other creatures yield oil, but none so much as the whale. The livers of the cod and the halibut, two kinds of fish, yield nourishing oil. Both cod liver oil and halibut liver oil are given to sick children and other invalids who need certain vitamins. These oils may be bought at any chemist’s. Vegetable oil has been known from antiquity. No household can get on without it, for it is used in cooking. Perfumes may be made from the oils of certain flowers. Soaps are made from vegetable and animal oils. To the ordinary man, one kind of oil may be as important as another. But when the politician or the engineer refers to oil, he almost always means mineral oil, the oil that drives tanks, aeroplanes and warships, motor-cars and diesel locomotives, the oil that is used to lubricate all kinds of machinery. This is the oil that has changed the life of the common man. When it is refined into petrol it is used to drive the internal combustion engine. To it we owe the existence of the motor-car, which has replaced the private carriage drawn by the horse. To it we owe the possibility of flying. It has changed the methods of warfare on land and sea. This kind of oil comes out of the earth. Because it burns well, it is used as fuel and in some ways it is superior to coal in this respect. Many big ships now burn oil instead of coal. Because it burns brightly, it is used for illumination; countless homes are still illuminated with oil-burning lamps. Because it is very slippery, it is used for lubrication. Two metal surfaces rubbing together cause friction and heat; but if they are separated by a thin film of oil, the friction and heat are reduced. No machine would work for long if it were not properly lubricated. The oil used for this purpose must be of the correct thickness; if it is too thin it will not give sufficient lubrication, and if it is too thick it will not reach all parts that must be lubricated.


相关文章:
An Introduction to Oil and Gas 中英对照
Four prerequisites are necessary for oil and gas to 若某一地区的油气储量要达到以下四个条件缺 accumulate in commercial quantities in an area: (1) 商业...
OIL8红外测油仪的使用注意事项和主要操作步骤
图1 整机框图 6 SN-OIL8 红外测油仪说明书 图2 光学原理图 六、使用方法 6.1 仪器安装 打开包装纸箱,将仪器取出,放置在工作台上,有条件的实验室 可放于...
The Refining of Oil
The Refining of Oil A Imagine a world without petroleum; a world without cars, plastics, aviation fuel, tyre or tar-sealed roads, in fact a world ...
For generations coal and oil have been regarded as ...
For generations coal and oil have been regarded as the chief energy sources used to transpolt men from place to place. A.煤和石油世世代代都被认为是...
Oil By G.C. Thornley
Thornley_文学研究_人文社科_专业资料。Oil By G.C. Thornley There are three main groups of oils: animal, vegetab le, and mineral. Great qu ...
OIL代码自动生成技术过程中的部分研究
OIL 代码自动生成技术过程中的部分研究 摘要: 针对 OSEK 标准的应用设计了一个从 OIL 代码到 C 代码的自动生成系统, 该系 统允许用户输入 OIL 配置文件信息,...
OIL460型红外测油仪
OIL460 型红外测油仪基本原理 根据 GB/T16488—1996 标准,用四氯化碳萃取水中的油类物质,测定 总萃取物, 然后将萃取液用硅酸镁吸附,经脱除动植物油等极性物质 ...
Oil
Great quantities of animal oil come from whales, those enormous creatures of the sea which are the largest remaining animals in the world. To protect ...
How_Oil_Drilling_Works——钻井是如何工作的!
1 How Oil Drilling Works Photo courtesy Phillips Petroleum Co. Offshore oil rig In January 2001 alone, the United States produced an estimated 181 million...
China_oil_and_gas_industry
oil and gasoil and gas隐藏>> Industry Overview China’s oil & gas industry is subject to a high degree of government control. The market is ...
更多相关标签: