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1) Hide Edge动荡乱世敌我难分First, unify the interfaces:被海昏刘贺强抢的美貌绝冠县令之女李静香，新婚之夜吞下私定终身叶孤航赠与的凤鸣石，变成厄难之体的她意外让刘贺之子惨死，被活埋千年之后被盗墓者们意外放出……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.严嵩当权多年，在这一天，终于有了破绽。(3) The principle of electric time relay is similar to that of clocks and watches. It is delayed by the internal motor driving the reduction gear to rotate. This kind of relay has high delay accuracy and wide delay range (0.4 ~ 72h), but its structure is complicated and its price is very expensive.