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(1) The utility model provides a low-temperature stop valve, wherein a guide sleeve is added at the valve disc, and is fixed by bolts and elastic pads, so as to position and guide the seal of the valve; ;The Liskov Substitution Principle (LSP) is one of the basic principles of object-oriented design. The Richter substitution principle says that wherever a base class can appear, subclasses can certainly appear. LSP is the cornerstone of inheritance reuse. Only when derivative classes can replace base classes and the functions of software units are not affected can base classes be truly reused, and derivative classes can also add new behaviors to base classes. The Richter substitution principle is a supplement to the "open-close" principle. The key step to realize the "open-close" principle is abstraction. The inheritance relationship between the base class and the subclass is the concrete realization of abstraction, so the Richter substitution principle is the specification of the concrete steps to realize abstraction. --From Baidu2016年5月26日，正式成立“方块学园”。“方块学园”是优酷土豆联合《Minecraft》知名UP主“籽岷”、“炎黄蜀黍”、“大橙橙橙子”、“粉鱼Pink__Fish”和“五之歌”等其他UP主共同打造《Minecraft》国内原创游戏同人剧频道。该游戏的视频节目在优酷每日播放量也超过千万。上述提到的五名UP主在优酷土豆的自频道总订阅数超过770万，视频总播量超过17.5亿，其中仅“籽岷”一人就拥有307万粉丝以及10.7亿视频播放量，在优酷游戏频道排名第1，全站第1，是国内《Minecraft》游戏视频播放量最大，最受欢迎的UP主。“方块学园”情景短剧的故事场景是一个学园，剧中主角们的学习、生活等日常都在这里展开。学园校训是“格物致知”，而“格物”即代表方块。可以说，“方块学园”是籽岷等UP主在《Minecraft》中的延续和再开发，剧中角色的特点是他们在《Minecraft》这个游戏中的投影。影片以一块价值百万的昂贵怀表为线索，农田中“不务正业”的武痴小伙石头，为向村民证明自己是全村人的希望，担起进城送表的重任，踏上了一条囧况不断的送表之路：途中不仅有美女出卖色相偷怀表，更有地头蛇威逼利诱...< span data-role= "jmp" data-params= "{'options': {'type ': 'jmp_table', 'template ':' $jmp_table ', 'content': {'txt ':'毕竟是自己辛苦打拼了那么久的发迹之地，巴蜀对于汉国的意义不言而喻，现在就这样丢了。