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Prototype mode refers to specifying the type of object to be created by giving a prototype object, and then creating more objects of the same type by copying. The main points of its implementation include: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.国际知名合唱团指挥家严梓朗（刘德华饰），为帮助昔日恩师（卢冠廷饰）返回香港，带领一群因闯祸而被迫参加“热血合唱团试验计划”的“废柴”学生们，从零起步学习合唱。众人一起面对生活的挫折与挑战，最终在音乐中找回了自我，用歌声治愈人生的同时，严梓朗深藏在心底的秘密也逐步被揭开……眼前一黑，绝望地堕入无边的黑夜。这一吵，赵锋也勃然大怒，将酒杯往桌上一顿，对胡敦大喝道：老匹夫，就你这样的也配在朝廷做官？正事不干，专门害人。本片将聚焦一个古巴裔美国家庭，围绕一位准新娘的父亲如何面对女儿的婚礼展开。　　陈秀出身贫寒、父亲早逝，她跟母亲一样都是普通工厂职工，家里还有一名弟弟，从小患有聋哑症，智力稍微偏低，陈秀一直孜孜不倦的教导弟弟怎么学习自立。