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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, A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the O-ring 10 is further arranged at 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 which 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 packing assembly 9 comprises a flexible graphite packing layer.清嘉庆年间，17岁的祁隽藻才华横溢。在经历了突如其来的家难之后，他开始思考如何为人，如何为读书人这一严峻的问题。通过跟随张观藜，年轻的祁隽藻树立起“以民为本”、“致君尧舜”、“使民小康”的人生信念，重回“科考”，最终金榜题名。在清王朝走向末路的时候，祁隽藻亲手处决了视为骨肉的“贪官”义弟--元白；在暗箭密布的政治波澜中，他用性命保护情同手足的“钦犯”义兄--怀义；而在个人的心灵深处，他珍藏着终生的挚爱--含黛。作为一个文人、士大夫，祁隽藻为自己的政治理念付出了他的全部--生命、爱情、亲情和财富，但他更看重的是“道”，这个“道”，正是天下良臣和文人志士们所共同追求的“道”，这便是“天地民心”。3. The supervision of students is relatively weak and the sense of learning scenes is low.外间，张槐和青木坐在桌边低声说话，见他们来了，招手示意小葱过去问话。《远方的家》通过旅行体验者的亲身讲述、民间达人的旅行情报、旅游资讯的权威发布、学者嘉宾的文化解读、旅游话题的实时互动，呈现多样化生活形态和旅行百科，彰显既有传承又具时代感的国家旅游形象。Public class User1 extensions User {Chapter IV Sound and Light Signals