问题 单项选择题 A1/A2型题

下列关于流能磨描述错误的是()

A.可进行粒度要求为3~20μm超微粉碎,因此又称为"微粉机"

B.可适用于热敏感性物料和低熔点物料的粉碎

C.设备简单、易于对机器及压缩空气进行无菌处理,可用于无菌粉末的粉碎

D.和其他粉碎机相比粉碎费用较高

E.流能磨和冲击式粉碎机的粉碎机理相同

答案

参考答案:E

解析:流能磨亦称为气流粉碎机,其粉碎特点:可进行粒度要求为3-20μm超微粉碎,因而具有"微粉机"之称;由于高压空气从喷嘴出时产生焦耳-汤姆逊冷却效应,故可适用于热敏感性物料和低熔点物料的粉碎;设备简单、易于对机器及压缩空气进行无菌处理,可用于无菌粉末的粉碎,但是粉碎的费用较高。其粉碎机理完全不同于其他粉碎机。所以答案为E。

单项选择题
阅读理解

A qualified doctor who rarely practiced but instead devoted his life to writing. He once said: “Medicine is my lawful wife, and literature is my lover.” Russian writer Anton Pavlovich Chekhov, was a great playwright and one of the masters of the modern short story.

When Chekhov entered the Moscow University Medical School in 1879, he started to publish hundreds of comic short stories to support his family. After he graduated, he wrote regularly for a local daily newspaper.

As a writer he was extremely fast, often producing a short story in an hour or less. Chekhov’s medical and science experience can be seen through the indifference(冷漠) many of his characters show to tragic events. In 1892, he became a full time writer and published some of his most memorable stories.

Chekhov often wrote about the sufferings of life in small town Russia. Tragic events control his characters who are filled with feelings of hopelessness and despair.

It is often said that nothing happens in Chekhov’s stories and plays. He made up for this with his exciting technique for developing drama within his characters. Chekhov’s work combined the calm attitude of a scientist and doctor with the sensitivity(敏感) of an artist.

Some of Chekhov's works were translated into Chinese as early as the 1940s. One of his famous stories, The Man in a Shell, about a school teacher’s extraordinarily orderly life, was selected as a text for Chinese senior students.

小题1:Anton Pavlovich Chekhov ________.

A.had a lawful lover

B.was an illegal writer

C.used to be a lawyer

D.was a competent doctor小题2:In 1880, Chekhov ________.

A.became a full-time writer

B.studied medicine in Moscow University

C.practiced medicine in his hometown

D.published his most memorable stories小题3:Which of the following adjectives can’t be used to describe Chekhov?

A.Sensitive.

B.Cool.

C.Quick-minded.

D.Warm-hearted.小题4:Which of the following is the right order of the events?

a. became a doctor

b. became a full time writer

c. started to publish comic short stories

d. wrote regularly for a local daily newspaper.

e. entered the Moscow University Medical School

A.e→c→a→d→b

B.d→a→b→c→e

C.e→c→b→a→d

D.a→e→c→b→d