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Add a rule at the end of the specified chain of the specified table. The-A option means that the rule is added at the end of the corresponding chain. When the-t option is omitted, it means that the rule in the filter table is operated by default.早恋，高中生时期一切的越界行为都被身为班长的小港严厉打击，但是小港自己却偷偷暗恋自己的女老师，为了讨好自己女老师，不惜出卖自己的妹妹小美。被出卖后的小美为了抗议与报复玩起了自杀游戏，没想到弄假成真。小美的亲身哥哥却发现了其中猫腻，本以为相安无事的两人却被幕后黑手操控着一步步走向灭亡。Chapter III Qualification License平凡的小镇，破旧的酒楼，最拐的角落坐着一个穷得连脚上的草鞋底都磨穿了，每次只喝最便宜的酒，连一文钱菜都不叫的八尺大汉。一群住在郊区的穆斯林好友追查其友人“马克”失踪的真相，后者被怀疑加入了 ISISA 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, A valve seat 7 is arranged between the valve disc 4 and the guide sleeve 6, a packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, an O-ring 10 is further arranged on 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, and the contact end of the valve disc 4 and the valve seat 7 is provided with a water grain surface 41.