国内对工程、起重运输机械的需求量随着国民经济的快速发展而越来越大，工程、起重运输机械这两大主机各生产厂家也为了迎接中国加入WTO后国外知名品牌的进入，纷纷致力于开发新品、拓展市场，提高产品质量、提升产品档次，现在各主机厂对零部件及外协件的质量，特别是零部件质 Domestic demand for engineering and hoisting and transporting machinery is increasing with the rapid development of the national economy. In order to meet the needs of well-known foreign brands entering China after China’s accession to the WTO, the major manufacturers of engineering and lifting and transport machinery, Have been committed to the development of new products, expand the market, improve product quality, enhance product quality, and now the OEMs and spare parts on the quality of parts, especially the quality of parts