两个学霸边做题边c我

A low temperature stop valve, Unlike Example 1, Comprises a valve body 1 and a valve cover 2, A valve stem 3 is arrange in that valve body 1, One end of the valve stem 3 is provided with a valve disc 4, The other end of the valve stem 3 is provided with an adjusting handwheel 5, A low portion of that disc 4 is provided with a guide sleeve 6, The guide sleeve 6 is fixed by means of a connecting piece and a spring pad 8, Between that disc 4 and the guide sleeve 6 is provide a valve seat 7, Between that valve stem 3 and the valve cov 2 there is provided a packing assembly 9, An O-ring 10 is further dispose at that upper portion of the packing assembly 9, An upper part of that O-ring 10 is provide with a packing gland 11, The valve body 1 is provided with an arc-shaped end face 12, the arc-shaped end face 12 forms a line seal between the valve body 1 and the valve seat 7, the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41, the packing assembly 9 comprises a flexible graphite packing layer, the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity, the two O-rings 10 are concentric arranged, and the inner diameter and outer diameter of the two O-rings are different.凭借《纸上城市》（Paper Towns）而展露头脚的新人纳特·沃尔夫（Nat Wolff）最近正洽谈主演恐怖片《死亡笔记》（Death Note），该片由华纳兄弟公司出品，根据同名热门日本漫画改编。By April 2017, the number of affected clubs had increased to 311. As of March 31, 2017, the number of suspects had reached 252 and 560 potential victims.对王家三房的大少爷较为中意，不知此时可定下了。在香港街头，一群人在听一个说书人讲故事。一辆警车开来，以妨碍交通为名将说书人带回警局。有两个人为了继续听故事而跟警察动手，为的是能和说书人一起被带回警局。说书人说的是多年前一个著名的粤剧编剧南海十三郎的故事。十三郎生于广东南海，在家中排行十三，父亲是江太史公。在一次慈善舞会上，十三郎对上海女子莉莉一见钟情，并追随其到上海，但莉莉对他并无好感。于致远、赵佳妮结婚五年，3岁半的儿子于震轩周一至周五住在外婆家，夫妻二人只有双休日才把孩子接回家，享受短暂的亲子时光，他们是这个城市里司空见惯的“周末父母”。一次偶然的机会，赵佳妮意识到“父母是有有效期的”，为了能够参与儿子的成长，夫妻二人开始努力奋斗，争取早日结束这样的生活。在奋斗的过程中，于致远从一个愣头青记者成长为铮铮铁骨的当家主编，而赵佳妮也从一个碌碌无为的小女人晋升为独当一面的外企员工。在这个过程中，这对小夫妻面对高速发展的社会中的诱惑，一次次守住底线，向着目标前进。最终，他们坚守住时代的价值观，彼此不离不弃，终于明白陪伴才是对孩子最深的爱。As the name implies, the decoration mode is to add some new functions to an object, and it is dynamic. It requires the decoration object and the decorated object to realize the same interface. The decoration object holds an instance of the decorated object. The diagram is as follows: