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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.Through the management of the connection pool, the sharing of database connections is realized, and the connection does not need to be recreated every time, thus saving the overhead of database recreation and improving the performance of the system!葫芦喝道：闭嘴。Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example:原本宁静的阿尔特里亚大陆，被黑龙及其魔物追随者的势力所席卷。乱世下，民不聊生。 绰号小鱼的兰伯特，是生活在小村庄里的普通少年，却为了保护村庄，在误打误撞中作为小跟班加入了为讨伐黑龙而建立的英雄联盟。这支由精灵、魔法师、游侠和传奇战士组成的临时杂牌联盟，踏上了失落已久的古道，翻越诡异的丛林和奇幻的雪山寻觅黑龙的巢穴。可前方，却有意想不到的危机等着他们的到来。 旅程的艰辛和奇异的境遇让兰伯特迅速成长起来，可他最终能找到属于自己的战斗的意义吗？