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The papers main contents come from the science research named the Structure Optimizing and Working Action Simulating Research of Down-hole Packer that are developed by South West Petroleum Institute and JiangHan Oil Withdrawal Technology Research Institute that is a subcompany of China Petrochemical Corporation in JiangHan oil field.
本论文的研究工作是中国石化集团江汉油田分公司采油工艺研究院与西南石油学院合作开发的科研课题&井下封隔器结构优化及工作行为仿真研究&的主要内容。
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It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.
从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。
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The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.
集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐
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The eˉtiology of hemospermia is complicate,but almost of hemospermia are benign.
血精的原因很，以良性病变为主。