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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.　　可是一系列抽丝剥茧的调查与惊心动魄的冲突，不断让事情发生转变。危机四伏的境外势力暗潮涌动，爱情是否真挚？兄弟是否各怀鬼胎？不断的怀疑与试炼使主人公深陷重围。“悍土孤城，向死而生”，真相也以随时付出生命为代价，逐渐浮出水面……，不断地袭击骚扰敌人，给日军以有效的打击。武工队充分发挥自己小而灵的特点，深入群众、发动群众，革命工作如鱼得水。在斗争活动中，武工队和以林双珊为队长的抗日特遣队相遇，在消除最初的误会和不信任之后，双方互相支持，共同作战，在敌人力量薄弱的地方，开展机动灵活的麻雀战。武工队挺进沦陷区，在广大人民群众的掩护和支持下，在特遣队的协助下，克服困难，灵活地执行作战方案，与敌人斗智斗勇，屡屡粉碎敌人的计划，给敌人以沉重打击Age: 12This.writtenTest ();四大名著中的经典代表作，人物形象生动，六小龄童的孙悟空经典得难以超越。故事讲述了东胜神州的傲来国花果山的一块巨石孕育出了一只明灵石猴，石猴后来拜须菩提为师后习得了七十二变，具有了通天本领，于是占山为王，自称齐天大圣。后来大圣受观音指引，拜唐僧为师，师徒二人踏上了取经的路途。之后猪八戒，沙悟能也加入队伍，师徒四人一路破除艰难，除掉各种妖怪，最终成功到达西天，完成取经任务。讲述一名前哲学系教授（Glenn Howerton饰）失去梦寐以求的工作后，只好去到高中接受一份教授大学预修生物学课程的工作，但明确表示不会教授任何生物学的他，决定利用这群优等生来报复在主角人生中冤枉他的人。