近年来,国外发达国家农业发展的特点是:农业生产的集中化和专业化,复杂而昂贵的农业机械的运用和劳动力不足。这就影响到农业生产的组织,要求精细的解决辅助生产过程,特别是农业运输问题。在农业上,主要的运输工具是轮式拖拉机,但是,自走式机械、装卸机和载重 In recent years, the characteristics of agricultural development in developed countries abroad are: the centralization and specialization of agricultural production, the use of complex and expensive agricultural machinery, and the shortage of labor. This affects the organization of agricultural production and requires careful resolution of the supporting production process, especially the issue of agricultural transportation. In agriculture, the main means of transport are wheeled tractors, but self-propelled machines, loaders and trucks