任务型读写. 任务型读写. From the beginning of
来源:学生作业帮 编辑:作业帮 分类:英语作业 时间:2024/07/17 03:23:13
任务型读写.
任务型读写. From the beginning of human history,people have used oils from seeds and nuts.Most of the time these oils are used as food,especially in cooking.But sometimes they have other uses.For example,oils are used in paint and in cleaning products like soap. Oils are separated from seeds by using pressure.A machine called a press is often used. The first step in pressing the oil from seeds is to crush the seeds between two stones.The crushed seeds are then put into a cloth bag and the bag is hung up.Some of the oil will flow out of the bag and can be collected. But some oils will remain in the crushed seeds inside the bag.The easiest way to get the rest of the oil out is to place heavy rocks on the crushed material. Another method is to place several cloth bags on top of each other in a box.Then a long wooden stick is used to slowly push a heavy cover down on the bags.Great pressure is produced in this way.Much greater pressure can be produced by using a machine,a hydraulic jack (液压千斤顶).The greater the pressure is,the more oils will be produced. Small presses are important in areas where electricity or gasoline cannot be used.They are also a good way to test if a local market for oils exists. Small batch presses can be made of local materials.Their cost is low.They are not difficult to operate. And they are easy to repair.The small presses produce good quality oils.But the work is hard.And getting all the oil from the seeds can be difficult. If there is a large supply of seeds,then handoperated presses may not be enough to support a business. Large powered presses that can operate all day are needed.
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6.amount/quantity 7.price 8.short/lack 9.powered 10.deal/do
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