双皮圈牵伸装置下销呈阶梯形、中铁辊后移、前皮辊前移，各有什么用途？
参考答案：
下销的界面更呈阶梯形，其最高点上托1.5㎜，使上、下皮圈工作面形成缓和的曲线通道，以防止皮圈的中凹现象。平面部分不与皮圈接触，使该处形成拱形弹性层与上皮圈配合，以减少销子与皮圈的摩擦。下销前缘突出，以结合上销前端前冲来减少牵伸区中的浮游区长度。中铁辊后移，使皮圈对中罗拉的包围弧加大，以利于上皮圈的回转，减少因上、下皮圈速差而引起的须条分层现象。前皮辊前移，以减小突出须条对前罗拉表面的包围弧，减小无捻区，降低粗纱断头。
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| I will describe(描述) three people to you. One of them is a criminal (罪犯). Then you must decide which person is the criminal. Jane weighs 69 kilos and is l.75 meters tall. Her age is 39 and the size of her shoes is 8. At the time of crime, she was wearing a brown dress. She has a sports car. Jim is 30 years old and wears size 8 shoes. He is 1.82 meters tall and weighs 68 kilos. He was wearing a green suit(酉装) on that day. He has a sports car, too. Nancy is 22 years old, weighs 52 kilos, and is only 1. 50 meters tall. She wears size 5 shoes. She was in a red blouse and skirt on the day of the crime. She drives a very fast sports car. The criminal is under 40 years old and weighs between 60 and 70 kilos. The height is about l. 80 meters. The shoe size is 8 0r 9. We think the criminal is wearing green clothes and driving a small fast car.
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