问题 问答题

粘土对型砂的性能有何影响?

答案

参考答案:

1)对湿压强度的影响:水分适当时,随着粘土量的增加,型砂湿压强度增高,

2)对透气性的影响:如果保持型砂的水分为最适宜状态,则透气性随着膨润土的增加而提高

3)对于强度的影响。粘土砂的干强度对湿型浇注初期和落砂性能有实际意义。

4)对热湿拉强度的影响:粘土砂的热湿强度除了与粘土的加入量有关以外,最主要的影响因素是粘土的品种和人工活化膨润土时活化剂的加入量。

单项选择题 A1型题
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Across the planet there are millions of people who engage in some type of meditation, the practice of concentrating and clearing the mind to bring the body into a state of peace, at least a semi-regular basis. For some, particularly among practitioners of Eastern religions such as Buddhism and Hinduism, this is part and parcel of their religious practice.

For others, particularly in Western cultures, meditation tends to be a response to stress. With the world economy approaching meltdown and people worried about their job or their ability to keep their home, it’s a way for people to attain a state of peace of mind and well-being.

For those interested in taking up the practice, instruction in meditation for beginners can be found in literally thousands of sources.

One of the most popular styles of mediation in the West, with classes offered in most major cities, is called Transcendental Meditation. TM, as it is known among its practitioners, first came to worldwide attention when the Beatles began practicing it in 1967. For direct, guided, personal instruction in meditation for the beginner, TM may be the hallmark.

Part of the confusion about how to practice meditation effectively is due to the fact that there are literally hundreds of techniques championed by various groups and individuals. As a general principle, it might be said that all meditation techniques seek to have the practitioner attain a state of consciousness that is different to our ordinary state of awareness. They attempt to train people to clear their minds and achieve a sense of inner peace. It sounds simple enough, but of the huge number of people experiment with meditation, very few are able to maintain its practice over the long haul. In most cases, this is due to frustration over the inability to experience any dramatic, instantly recognizable effects.

This is quite a sad state of affairs, that so few these days are willing or equipped to persist in something that doesn’t provide immediate life-changing results. It reflects a culture in which demands for discipline and sustained effort are considered unnecessary or even unfair. It is no surprise therefore that many people abandon their efforts at meditation before they have a chance to bear fruit.

But for anyone who does decide to take up this worthwhile practice, please remember. You must clear your mind, relax and “take it as it comes”. Maintain the practice with a sense of discipline and devotion, and eventually benefits of inner peace and calm will be yours.

小题1:The underlined part “part and parcel of” in paragraph 1 is nearest in meaning to ________.

A.closely associated with

B.very different to

C.usually sent from

D.an important element of小题2:The goal of meditation is ________.

A.to clear the mind

B.to practice a religion

C.to develop a technique

D.to carry out an experiment小题3:What can we infer about meditation from the passage?

A.It has two main types.

B.It is practiced by many famous artists.

C.Its benefits are not immediately obvious.

D.Most people find it a very good way to relax.小题4:According to the writer, what has attracted many Western people to meditation practices in recent years?

A.Their improved understanding of foreign culture.

B.The need to fill in their growing free time.

C.Increasing employment instability.

D.Migration from countries in which meditation is traditional.小题5:Who is the probable audience for this article?

A.Experienced meditation practitioners.

B.People interested in starting to learn meditation.

C.Buddhists and Hindus.

D.People who are very religious.