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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.? Starting from this section, we introduce in detail the concepts and application scenarios of 23 design patterns in Java, and analyze them in combination with their characteristics and the principles of design patterns.2. The server generates a Token and puts it in the user's Session or the browser's Cookie.　　精打细算、爱钱如命的杨朵正是杨果的姐姐，其实她和杨果小时候曾是家境富裕的千金小姐，但在精明能干的母亲过世后，好高骛远的父亲很快就把家产败光，留下两个年幼的女儿，独自逃到外地躲债。从此，姐妹俩相依为命，生活的磨难养成了她们独立坚强的性格，巍巍皇城，紫气东来。贾史王薛四大家族，尽享泼天财富，却不知富贵终有尽，屋子沉湎于纸醉金迷之中，不愿苏醒。在荣国府，含玉而生的公子哥贾宝玉（杨洋 饰）与好姐妹们无忧无虑地成长，吟诗作赋，猜谜烹肉，兼带诌些感时伤怀的矫情文字。他与妹妹林黛玉（蒋梦婕 饰）两小无猜，互有所属，然几番试探，倒惹得误会连连。繁花烂漫、歌舞升平的大观园，锁不住那心底的寂寞，护不住那嫩蕊芳沁，儿女情长何处寻，生离死别自悲吟，一任如花美眷为暴风雨摧残凋零，好一似食尽鸟投林，落得白茫茫大地真干净……Before seeing Lin Huiyin, Jia Baoyu was full of dissatisfaction. Although a dude like him would not be disrespectful in front of people because of family education, before Lin Huiyin came to him...