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A packing assembly 9 is arranged between the valve stem 3 and the valve cover 2, the 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. The arcuate end face 12 forms a line seal between the sealing surface of the valve body 1 and the valve seat 7. The water grain 41 can ensure the sealing performance of the valve seat 7 and the valve disc 4.What is a birthday note?这两件事有关系么？靠祭海平倭乱么？那还练什么兵啊。属下在。65岁的杀手Leslie非常热爱他的工作但是年事已高，手已很抖。杀手工会的新老板上任以后要求他们必须要完成工作量才能保住自己的会员资格。Leslie不想被迫退休，又怕达不到工作量，于是只好把客户目标放在了自杀者身上。他在一座桥上偶遇了正在跳河的William。27岁的William已经尝试过了九次自杀，成功率为零，他也意识到需要找一个专业杀手帮自己解脱。Leslie递给他一份叫做your death……your way的广告小册子。William原本打算像英雄一样死个轰轰烈烈，但看了一遍小册子后选择了快速无痛死亡，这并不是他的最佳选择，但却是他唯一支付得起的死法。Leslie保证了不会绞死他以后，两个人签下了合同，一个星期包死，不死包赔。然而William在回去等死的期间突然遇到了自己喜欢的女生，第一次发现了生命的重量与意义，于是他又不想死了。然而合同已经签了，Leslie又是个守信敬业的杀手，那么William能成功逃脱过这个死亡合同么？　　3×10《Witness》：所有剧情线索都汇聚到Railly和Cole身上。Titan逼近，盟友被迫自相残杀，「见证者」站到命运的入口。2. If radar equipment is equipped and usable, it shall be used correctly, including long-distance scanning, in order to obtain early warning of collision risks, and radar plotting or equivalent systematic observation of detected objects.