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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, 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.　　该片讲述了记者丁一为了揭开房地产销售内幕，他来到一家售楼处当起了售楼先生。在售楼部暗访时得知售楼小姐艾丽丽是一个利用自己的身体条件，色诱客户以达到销售业绩为目的销售房屋的内幕。从而揭示了大量不为人知的事情真相，行业的潜规则，描摹了底层社会众生相。"What is that big wasp?" I asked.依据越国的封地，发展壮大自己的实力，金戈铁马，逐鹿天下。2017-07-15 15:33:04The main difference between the proxy mode and the appearance mode is that the proxy object cannot directly access the object, but can only be accessed by the proxy object, while the appearance object provides a simplified access call interface for each subsystem, while the adapter mode does not need to fabricate a proxy, so as to reuse the original interface. The appearance mode defines a new interface, while the adapter reuses an existing interface.樱桃还没熟哩，就流口水了。