问题 问答题 简答题

简述压缩空气净化设备及其主要作用。

答案

参考答案:

压缩空气净化设备一般包括后冷却器、油水分离器、贮气罐、干燥器。后冷却器安装在空气压缩机出口管道上,它将压缩空气中油雾和水汽达到饱和使其大部分凝结成滴而析出。油水分离器安装在后冷却器后的管道上,作用是分离压缩空气中所含的水分、油分等杂质,使压缩空气得到初步净化。贮气罐的主要作用是贮存一定数量的压缩空气,减少气源输出气流脉动,增加气流连续性,进一步分离压缩空气中的水分和油分。干燥器的作用是进一步除去压缩空气中含有的水分、油分、颗粒杂质等,使压缩空气干燥。

完形填空

第二节(共5小题;每小题2分,共10分)

根据短文内容,从短文后的选项中选出能填人空白处的最佳选项。选项中有两项为多余选项。

Most drinks stating that they are fruit-flavored (水果味道的) contain no fruit at all, while most of the rest contain only a small quantity of fruit, according to a study carried by the British Food Commission.

"Shoppers need to check the labels(标签)before buying drinks, though sometimes the actual content can be non-existent," said Food Commission spokesperson Lan Tokelove."Food production is highly competitive.___71 __ It will increase profits, and consumers won't always realize they are being tricked."

Flavorings are focused on the flavors of natural food products such as fruits, meats and vegetables, or creating flavor for food products that do not have the desired flavors.Researchers analyzed the contents of 28 strawberry-flavored products sold in stores.   72   Of the 11 products that did contain strawberries, five of them contained less than one percent real fruit.In addition, each juice box contained nearly eight teaspoons of sugar.

73    Let’s take jam as an example. Some strawberry-flavored jam was labeled as containing no artificial colors, flavors, or sweeteners, but it contained absolutely no strawberries at all.

74    Consumers have the rights to know clearly about what they have bought.Under current UK law. Food packages do no not have to distinguish between natural and artificial flavoring. “Describing a product as strawberry flavor and covering the surface of the packed with pictures of stawberries is misleading.   75  Unfortunatcly, it is also legal and widespread,” Tokelove said.

A.The products which contain real fruit are popular with people.

B.Even products advertised as more natural often contained no fruit.

C.They found that about 60 percent of them didn't contain any fruit at all.

D.If companies can cut their costs by using flavoring, they are likely to do so. E.It is important and necessary to demand a small amount of flavoring in the products.

F.Actually the product contains just a tiny percentage of strawberry or even no fruit at all.

G.The Food Commission suggested all flavors used in a product should be listed on the packaging.

单项选择题 A型题