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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, A valve seat 7 is arranged between the valve disc 4 and the guide sleeve 6, a packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, an 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.According to the classification of flame retardant elements, it is divided into halogen-containing flame retardant, phosphorus-containing flame retardant, nitrogen-containing flame retardant, etc.到底该怎么办呢？护卫头领潘云见自家少爷似乎有些放不下香儿，而这个林队长却横加阻止。尹旭说道：关中那边虽然已经成功在即，但还是有风险的，不管怎么说萧何在那里经营了好多年。民国时期的上海，一起脸谱连环杀人案引发城市的混乱，私家侦探陈一鸣卷入其中调查，并因此结识巡捕局长之子张天笑和海归美女姚菲，三人组成侦探团破获此案，陈一鸣却发现案件背后似乎还隐藏着更神秘的阴谋。在三人协作破获诸多案件的过程中，彼此之间的情谊逐渐加深。在揭开一个个真相的同时，陈一鸣的身世谜团也逐渐浮出水面。在收到神秘匿名信后，陈一鸣等人前去“日落别墅”参加晚宴，不料却因此陷入一场杀戮之中。陈一鸣与罪犯不断斗智斗勇，却惊觉真正的幕后黑手早已伪装在自己身边，为报弑父之仇酝酿着复仇计划。在愤怒、背叛、谎言的多重裹挟中，深藏其中的真相终将现世……The "hedgehog" technique is a very effective one among all kinds of questions to promote business transactions. The so-called "hedgehog" reaction is characterized by you using a question to answer the customer's question. You use your own questions to control your discussions with customers and lead the conversation to the next step in the sales process. Let's take a look at Hedgehog's reactive questioning method: Customer: "Is there any cash value in this insurance? "Salesman:" Do you attach great importance to the question of whether the insurance policy has cash value? Customer: Absolutely not. I just don't want to pay any extra amount for the cash value. "For this customer, if you just sell him cash value, you will push yourself into the river and sink to the bottom. This person does not want to pay for the cash value, because he does not want to regard the cash value as an interest. At this time, you should explain to him the meaning of the term cash value and improve his understanding in this respect.The combustion portion spreads into the mixing area of the combustible gas and oxygen