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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.突然，沉重的脚步声传来，打破了林间的宁静。看来你真是天启的铁粉，都激动得哭了。Q: Which machine learning algorithm do you prefer most?Editor's Note: This article is transferred from WeChat's public number "KMCenter for Knowledge Management" (KMCenter). The author is Tian Zhigang, a well-known knowledge management expert, who is the author of "Your Knowledge Needs Management". The content of this article is the material of "How to Become an Expert". 36 Krypton is authorize to forward.The template method pattern defines the algorithm skeleton in an operation in an abstract class and delays the implementation of some specific steps to subclasses. The template method enables subclasses to redefine specific steps of the algorithm without changing the structure of the algorithm, thus achieving the effect of reusing codes. The specific structure diagram is shown below.影片讲述了安可带着男友关天去医院看病，可是男友进入手术室以后就再也没出来。焦急的安可开始寻找，她发现手术室里空无一人，而且整个医院里也变得空无一人。同时医院也开始发生各种怪事，太平间复活的阴尸、走廊里闪现的鬼影、地下车库里出现的怪物、男友电话里传来的求救声，整个医院仿佛就是人间地狱……