问题 问答题 简答题

简述斗式提升机的型号、规格及使用性能?

答案

参考答案:

斗式提升机的型号有HL(TH)型、PL(NE)型、D(GTD)型等,其规格以料斗宽度表示,HL型有300、500等规格,PL型有250、350、450等规格。斗式提升机是水泥厂最常用的垂直输送机,通常用以提升块、粒状物料以及粉状物料,由于链条,胶带拉力限制,提升高度一般不超过30米。近年来生产的新型斗式提升机TH型、NE型、GTD型输送能力都超过了100吨/小时;提升高度超过70米;尤其是钢丝绳芯胶带斗式提升机(GTD型)输送能力达到1600吨/小时以上,提升高度超过90米。

填空题
单项选择题

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never ending flood of words. In (1) a job or advancing in one, the ability to read and comprehend (2) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (3) readers. Most of us develop poor reading (4) at an early age, and never get over them. The main deficiency (5) in the actual stuff of language itself—words. Taken individually, words have (6) meaning until they are strung together into phrases, sentences and paragraphs. (7) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (8) words or passages. Regression, the tendency to look back over (9) you have just read, is a common bad habit in reading. Another habit which (10) down the speed of reading is vocalization—sounding each word either orally or mentally as (11) reads.

To overcome these bad habits, some reading clinics use a device called an (12) , which moves a bar(or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (13) the reader finds comfortable, in order to "stretch" him. The accelerator forces the reader to read fast, (14) word by word reading, regression and subvocalization practically impossible. At first (15) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (16) your comprehension will improve. Many people have found (17) reading skill drastically improved after some training. (18) Charlie Au, a business manager, for instance. His reading rate was a reasonably good 172 words a minute(19) the training; now it is an excellent 1,378 words a minute. He is delighted that how he can (20) a lot more reading material in a short period of time.

第(13)空应选择()

A.then

B.as

C.beyond

D.than