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2. The policy pattern provides an open-closed principle, making the code easier to understand and expand.A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the O-ring 10 is further arranged on the upper part 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, and the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41. The arcuate end face 12 forms a line seal between the sealing surface of the valve body 1 and the valve seat 7. The water grain 41 can ensure the sealing performance of the valve seat 7 and the valve disc 4.元朝末年，少林寺与大漠之王共同埋下一笔巨额财宝，藏宝图一分为二，各执一半。商定，非国家危难之时，不得动用。但不知何时，天机已泄。数年后，少林寺主持圆寂，镇寺袈裟被盗，继任主持不语大师蒙冤身陷囚牢，佛家净地，风云顿起。 在此多事之秋，贫苦少年张三丰，杨轨山，小莲邂遇在少林。不语大师为洗奇冤，夺回袈裟，保护珍宝，秘授三丰少林嫡传真功和藏宝图，并委重任。负儿，你可确定？一个中年男子轻声问道。3) If Ping does not work, it may be a network protocol configuration problem. Check the computer's IP address, gateway, DNS and other configurations.故事围绕一名杀手在最后一次任务中，陷入了困境。