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5-Fruit FructusA 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.而杨继盛坐牢时，无人敢近，唯王忬父子，杨继盛死了也没人收尸，也仅有王世贞做了这件事，可以说这对父子很久以前就上了严党要搞的名单。午夜2点，玫瑰园小区附近突然响起枪声，市外贸局长裘成贵倒在血泊里，市刑警支队副支队长朱光奉命接手此案，公安局长南平却收回命令，要朱光把案子交给副支队长史金浩负责……县城一役让李向阳率领的武工队名声大震，日本鬼子顿时成了没头苍蝇。善于逢迎媚上的渡边被日军司令冈村提拔为联队大佐。渡边对李向阳的神出鬼没颇为胆寒，抱着不求有功但求无过的心思龟缩在县城，一时武工队和日本人倒也相安无事。渡边整天忙着讨好冈村派下来的谍报专家贞子，小日子过得不亦乐乎，直到一心为兄报仇的松井横二的到来，终于打破了这短暂的平静。Although there are subclasses in java that implement the interfaces of the parent class, But I think javascript can be different from java, It is possible that the parent class in java is an empty class, Subclasses to implement the interface of the parent class, in javascript, I think the common code is completely written in the parent function. If the business logic needs to be changed in the future, or new business logic is added, we can completely use subclasses to rewrite the parent class, so the code has strong scalability and is easier to maintain. Since I am not a professional java, please understand if there is any mistake in describing the knowledge points in java ~ ~