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Public class StrategyTest {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.In the second season of "Charming China City", it will continue to select 32 cities with the most characteristics and vitality in China, and will lead the competition team with city leaders to show the unique culture and charm of the city through different forms such as creativity, science and technology, culture and intangible cultural heritage. Thirty-two cities passed two rounds of competition, and the 2018 "Top Ten Charming Cities", "Outstanding Charming Cities" and "Charming Cities" were jointly voted by the guest group and the audience.It is worth noting that the clockwise direction of the famous city line is called "right return" and the counterclockwise direction is "left return". In addition, it can be seen from the figure that the famous city line divides into two lines at Jinshan Station 1 in the counterclockwise direction, one to Nagoya Port and the other to continue to advance counterclockwise. The line to Nagoya Port is called "Minggang Line". Attention should be paid to the name of the line when taking the counterclockwise line.The collection book can be customized according to your zodiac,鲁南某县刚刚解放不久，土匪横行，加之溃败的国民党匪兵四处抢劫，严重影响淮海战役的进行，为配合前方作战，我行署侦察科长于恩光奉命前来协助工作。县大队长葛风是他的妻子。新组建的该县公安局长杨振获悉自称是“草上飞”的一股土匪抢劫军粮，气焰嚣张。正准备清剿时，突然出现了数股“草上飞”，情况十分紧张。其实真正的“草上飞”早已回心转意回家孝敬母亲了。为了洗清罪名，真正的“草上飞”也正在追踪那些冒充自己名字的国民党军队和土匪。国民党散兵游勇和其他土匪一面冒充“草上飞”，大肆行凶作案，一面又千方百计企图同“草上飞”联手，壮大声势，对我后方进行更大的骚扰破坏。 　　针对一时真真假假，虚虚实实，到处都是“草上飞”，严重影响了支前任务的情况。于恩光同县大队的战友们一起，群策群力，斗智斗勇，感化了“草上飞”，几经曲折，使“草上飞”与我公安战士一起打入了敌匪内部。就在南京政府特派员封官许愿，兵匪合流，准备在我后方制造动乱时，我公安部队里应外合，将计就计，一举破获国民党军队，妄图破坏我后方供给的计划。