【正文】 sealing and seal asbestos products start to the early 1960s, begun production of mechanical seals and flexible graphite sealing products. 1970s, the burning of the former Ministry, a Ministry, the Ministry of Agricultural Mechanization System, a group of professional production plants have been established, and the official establishment of industries to seal industrial development has laid the foundation for growth. Since the 1980s, in the country39。s industry hydraulic billion yuan, accounting for the world39。 Pneumatic industry output 419 million yuan, accounting for world No. 10. the current supply and demand profiles Through the introduction of technology, independent development and technological innovation, and highpressure piston pump, gear pumps, vane pump, General Motors hydraulic valves, tanks, Nonlubricated aerodynamic pieces and various seals of the first large technology products has increased 外文資料翻譯 5 noticeably. stability of the mass production may, for various mainframe products provide a level of assurance. In addition, hydraulic and pneumatic ponents of the CAD system, pollution control, proportional servo technology has scored some achievements, and is already in production. Currently, hydraulic, pneumatic and seals products total about 3,000 species, more than 23,000 specifications. Among them, there are 1,200 hydraulic varieties, more than 10,000 specifications (including hydraulic products 60 varieties 500 specifications)。 Rubber seal 350 species more than 5,000 specifications have been basically cater to the different types of mainframe products to the general needs, plete sets of equipment for major varieties of matching rate was over 60%, and started a small amount of exports. 1998 pieces of homemade hydraulic output million. sales of about 28 billion (of which about 70% mechanical systems)。 Seals output of about 800 million. sales of about 10 billion (of which about 50% mechanical systems). According to the China Hydraulic Pneumatic Seals Industry Association 1998 annual report, hydraulic product sales rate of 97. 5% (101% for hydraulic), pneumatic %, % sealed. This full y reflects the basic marketing convergence. My hydraulic, pneumatic and sealing industry has attained a great deal of progress, but with mainframe development needs, and the world39。 aerodynamic pieces of the total demand of about 5 million, with sales more than 700 million yuan。 (2) the number of enterprises manufacturing technology, the level of equipment and management standards are paratively backward, coupled with a strong sense of quality, resulting in low levels of product performance, quality, Reliability poor services in a timely manner, lack of user satisfaction and trust of the brandname products。 (4) The internationalization of the domestic market and the increasing degree of foreign panies have entered the Chinese market and participate in petition with the domestic private and cooperative enterprises, individuals, foreignfunded enterprises, such as the rise of stateowned enterprises due to the growing impact. the development trend 外文資料翻譯 7 As the socialist market economy continues to deepen, hydraulic, pneumatic and sealing products in the market supply and demand and there is a greater change, long ago to a shortage of the seller39。s market place . Overall capacity, is already in oversupply situation, in particular the general low level of hydraulic, pneumatic and seals, the general oversupp