问题
问答题 简答题
何为线路高低？高低差超限的危害是什么？
答案
参考答案：
就一股钢轨讲，轨面高低不平的现象在养路工作中习惯称为前后高低，简称高低。正线和到发线允许在1m长的范围内有不超过4mm的高低差，其他线路允许不超过6mm的高低差。轨面高低不平对行车影响很大，严重时，列车上下颠簸，使机车车辆和线路设备受到损伤。
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何为线路高低？高低差超限的危害是什么？
参考答案：
就一股钢轨讲，轨面高低不平的现象在养路工作中习惯称为前后高低，简称高低。正线和到发线允许在1m长的范围内有不超过4mm的高低差，其他线路允许不超过6mm的高低差。轨面高低不平对行车影响很大，严重时，列车上下颠簸，使机车车辆和线路设备受到损伤。
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| Tom is a middle school student. He is studying in Grade 7. He usually 1 at 7:00 o'clock in the morning. 2 today he gets up at 6:30 and goes to buy a big cake. After that he helps his grandparents clean their room, because it is his 3 birthday. His grandpa is going to be 78 years old. Tom 4 two CDs about Beijing Opera (京剧) 5 his grandpa. He is sure his grandpa would like 6 very much, because his grandpa likes listening to Beijing Opera. When Tom 7 home at noon, his mother is making noodles with grandma. They are laughing and talking about something happily. His grandpa is drinking tea 8 listening to Beijing Opera. Tom says, "Happy birthday to you, grandpa." Then he cuts the big cake and gives grandpa a 9 piece. Grandpa is very happy and eats it. In the evening, Tom watches TV with his grandparents together. He is a little 10 but very happy, because he can make his grandparents happy. | ||||
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任务型阅读 (共l0空；每空l分，计l0分) 阅读下列短文，根据短文中的信息完成文后表格。（每空一词) The world is divided into two important parts. One half of the world is rich and the other half is poor. In the poor part, a lot of people never get enough to eat. In the rich part, many people eat too much. In one part, children are hungry and in the other, a lot of people are fatter and fatter and have to go on diets or do some exercise. For example, a dog or a cat in North America eats better than a child in the poorer countries. The poor countries have some difficult problems. Sometimes the land is too poor to grow anything on. The land can get better, but people have to do a lot of things first. They should learn how to enrich their land and how to find water. But rich countries have problems, too. Sometimes the air is too dirty to breathe and the rivers are too dirty to swim in or to take water. The roads and the streets are full of people and buses. Cars usually move very slowly. Noise is terrible. A lot of people do not have houses to live in. People must do something about these problems. We should do something to make the air and the rivers clean and build more houses. But it will take a long time.
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