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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, 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, 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, and the valve body 1 is provided with a liquid inlet cavity and a liquid outlet cavity.Next, we will listen to the onchange event in the drop-down box of colorSelect and the oninput event in the numberInput input box respectively, and then make corresponding processing in these two events.In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:Next, we are going to implement the Validator class, which is used here as Context and is responsible for receiving the user's request and delegating it to the strategy object, as follows:　　徽州青年导游马大海，收养了一个被遗弃的少女，取名马燕。两人相依为命，生活虽然清贫但却充满快乐。记者蓝岚在旅游度假之际，意外闯入了他们的生活。当发现余燕身患绝症，马大海和蓝岚一起，为了挽回余燕的生命……***她仰起脸，使劲把泪水往回憋，哑声道：香荽，二姐不是香荽，也不是小葱，更不是紫茄。白芍、白芨、白苏是老中医白守城的三个女儿。白守城鳏居多年，用自己的方式全心全力照顾女儿成长。然而，三千金中的长姐白芍和小妹白苏却不愿按部就班、谨遵父命，只待老爸再娶后赴美安度晚年便要展开自己率性的人生。白芍与自幼在外国长大的陆六安展开一段姐弟中外恋；白苏误打误撞恋上身为医师的型男大叔任海龙。而向来是乖乖女，早早结婚生子的白家二女儿白芨遭遇丈夫背叛。白守城因为女儿们频出的状况放弃出国计划，誓要让她们的生活重上正轨。一段段爱情与亲情交织的啼笑因缘过后，待嫁三千金终于迎来期待已久的幸福。