问题 问答题 简答题

胶质层最大厚度Y值与煤质有何关系?用它反应煤的粘结性有何优点和局限性?

答案

参考答案:

关系:膨胀度大,所测的Y值显著偏高,而煤的粘结性主要与液体的量有关,煤在热解过程中所产生的液体量越多,煤的粘结性越好。

优点:规定简单,重现性好,对中等煤化程度煤的粘结性区分能力强。用本法所测胶质层指标对评价煤的粘结性和炼焦配煤基本适用,且煤样的Y值具有加和性,对配煤具有一定的帮助。不仅可以测定Y值,而且可以确定胶质体温度间隔,最终收缩度,体积曲线和焦块特征等。

局限性:胶质层厚度Y值只能表示胶质体的数量而不能反应胶质体的质量。

问答题
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The decision to further all or part of your studies outside your country is a serious one, and one which for most students will have a special life-long benefit. If you realize English will help you in your career and enrich your personal life, you will find that coming to England to study English is a very special experience that you will never forget. I am very pleased to have this opportunity to invite you to join our English Language courses.

London is one of the world’s outstanding cultural and trade center. You will live in one of the world’s great cities. It provides the perfect arrangements in which to learn and develop English language skills. The international body of the students attending courses at English language Institutes in London provides an attraction because it is a good chance for you to enjoy other cultures in surroundings to develop personal character. As we prepare for the 21st Century, international communication has never been more important. To master a foreign language is becoming a useful tool for trade, industrial and professional success. Our aim at the English language Institutes is to develop students’ English language skills in friendly and helpful conditions.

Supported by computer, video and audio equipment, and using sound classroom, our team of teachers will guide you through your chosen course of study, you will receive excellent service and advice at every stage. Our out-of-class support staff will help you settle in and make the most of your stay in London. Truly, you will enjoy yourself in London and make friendships that will last a lifetime. I hope we can welcome you to this exciting world of London. Come and see us ! Visit a class in any of the English Language Institutes. See for yourself why we encourage you to study in London.

小题1:The phrase “life-long benefit” in the first paragraph means ________.

A.advantages in study

B.good in daily life

C.good in all life

D.use in work小题2:The writer invites you to join their English Language course, because __________.

London is really a good place for learning English

you can enjoy a special foreign culture

London is a great international trade center

Computers can teach you to learn English well

小题3: the main purpose of the text is ________.

to introduce something about London

to let know the importance of learning English

to tell us the skills of learning English

to tell us that education in London is free

小题4:This passage is a (n) ________.

A.story

B.novel

C.letter

D.advertisement