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2、重力分析的程序?

【参考答案】

⑴ 试样准备(准备试样):根据研究的目的和粒度要求将试样进行破碎、筛分、分级。(缩分出几份试样);⑵ 将试样按比重分离—按比重分离方法有很多:逐块测比重法;重液分离;重悬浮液分离;磁流体分离等;⑶ 可选性曲线的绘制.将比重分析结果用可选性曲线表示。
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未分类题听力原文: Ought you to give other people advice about how to live their lives? I don't know. But sometimes it is possible to give good advicE.When I was young, a stranger came to my house: a small man with shabby clothes and a round red facE.He told me he was working in a small hospital but didn't like his job therE.He asked whether there would be any opportunities for an English doctor in Spain. I warned him that Spain was not always the Spain of grand opera, but that he might earn enough to keep body and soul together. He must decide for himselF.He left me and I soon forgot him. Some years later I happened to be in ValenciA.Feeling rather unwell, I asked the hotel porter if there was an English speaking doctor in the town. He gave me an address.When I reached the house, a small cheerful-looking man met mE.He was the English-speaking doctor and invited me in. After he had examined me and told me what to do, I asked what his fee was.He shook his heaD.'There's no feE.Don't you recognize me? I was wondering whether I'd ever have a chance to thank you for what you've donE.You told me I might earn enough money to keep body and soul together and I haven't done much more than that. I shall never be rich, but that doesn't matter at all. I'm happy, I enjoy my job, and I wouldn't exchange it for anything else in the worlD.'(30)A.He thinks that it is somewhat impolitE.B.He thinks that it is sometimes possiblE.C.He thinks that it is something one ought to do.D.He thinks that it is always too difficult for a job to do.

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未分类题During the 1980s, unemployment(失业人数) and underemployment(不充分就业) in some countries was so high as 90 percent. Some countries did not【B1】enough food; basic needs in housing and clothing were not【B2】. Many of these countries looked【B3】the industrial processes of the developed nations for solution.【B4】, problems cannot always be solved by【B5】the industrialized nations. Industry in the developed nations is highly automated and very【B6】. It provides fewer jobs than labor-intensive industrial【B7】, and highly skilled workers are needed to【B8】and repair the equipment. These workers must be trained,【B9】many nations do not have the necessary training institutions. Thus, the【B10】of importing industry becomes higher. Students must be sent abroad to receive vocational and【B11】training.【B12】, just to begin training, the students must【B13】learn English, French, Germans, or JapanesE.The students then spend many years abroad, and【B14】do not return homE.All nations agree that science and technology should be shareD.The point is: countries【B15】the industrial processes of the developed nations need to look carefully【B16】the costs, be cause many of these costs are【B17】. Students from these nations should【B18】the problems of the industrialized countries closely.【B19】care, they will take home not the problems of science and technology,【B20】the benefits.【B1】A.generateB.boostC.produceD.manufacture

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D.【B19】care,
E.
【B1】
A.generate
B.boost
C.produce