According to the forecast of the German Machinery and Equipment Manufacturers Association, the export of machinery and equipment from Germany to China in 2004 will have a significant increase compared with the same period of last year. It is estimated that the annual export volume to China will reach 7.5 billion euros. China will become the second largest exporter of German machinery after the United States. In recent years, German machinery and equipment exports to China have been growing rapidly. Since 1997, German exports to China have increased by more than three times. At present, the cooling measures of the Chinese economy have not affected the rapid growth of German machinery exports to China. China's purchase of German machinery and equipment mainly includes plastic machinery, rubber machinery, textile machinery, machine tools, metallurgical machinery and other equipment. The German Plastics and Rubber Processing Association ? DMA ┩ 剖 剖 è¹ è¹ è† è† ? 004 004 004 exports to China in the first half of plastic machinery reached 433 million US dollars.
Piston is a reciprocating movement in the cylinder body of an automobile engine.
1. The basic structure of the piston can be divided into top, head and skirt. The top of the piston is the main part of the combustion chamber, and its shape is related to the selected combustion chamber form.
2. Gasoline engines mostly use flat-top pistons, which have the advantage of small heat absorption area.
3. The top of the diesel Engine Piston often has a variety of pits, and its specific shape, position and size must be adapted to the formation and combustion requirements of the diesel engine mixture.

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