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Through the study of singleton mode, we are told:改变他？别闹了，自己比他还惨。一个不知天高地厚的高中生成为大企业的领导之后发生的一系列故事的浪漫喜剧。徐仁国在剧中饰演的角色是高中曲棍球队的主攻手，是该校最具人气的高中生。他将代替身为IT专家的哥哥成为某公司的企划室长，上演一系列曲折有趣的故事。该剧根据郭晓冬饰演的西藏活佛“扎西”为核心人物，以藏人说藏事的方式展现三、四十年代西藏种种鲜为人知的日常生活原貌，体现扎西为推翻西藏农奴制度做出重要贡献的传奇一生。总不好整天在这忙，也要留些空出来读书。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, The upper part of the O-ring 10 is provided 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, and the two O-rings 10 are respectively arranged on the inner side and the outer side of the packing gland 11.The definition of a policy pattern is to define a series of algorithms, encapsulate them one by one, and make them replaceable with each other.