问题
填空题
紧急阀％内的紧急活塞杆上设有（）个缩孔，下部横向缩孔Ⅲ用来（）.
答案
参考答案：三、控制紧急制动时紧急室向大气的排气速度
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紧急阀％内的紧急活塞杆上设有（）个缩孔，下部横向缩孔Ⅲ用来（）.
参考答案：三、控制紧急制动时紧急室向大气的排气速度
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| Have you ever seen the advertisement-Learn a foreign language in six weeks, 1 give your money back! Of course, it 2 happens quite like that. The only language that is 3 to learn is the mother language. And think 4 practice is needed for that. Before the Second World War, people usually learned a foreign language 5 the literature (文学) of the country. Now most people want to 6 a foreign language. Every year 7 people start doing that. How do they do it? Some people try to learn at home 8 books and tapes, 9 go to evening classes or watch TV programs. 10 they use the language only two or three times a week, learning it will 11 a long time, like language learning at school. A few people try to learn a language fast by studying for six or 12 hours a day. It's much easier to learn the language in the country where it 13 . But most people are 14 to do this, and many people don't have to do so. Machines and good books will be very 15 , but they cannot do students' work. However the language is learned in a foreign country, it is hard work. | |||
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