１现状和存在的问题（１）由于联合收割机发展历史短，机型杂，机手对这一新技术了解少，因而增加了教学难度。温岭市自１９８９年引进第一台ＫＣ－０７０型联合收割机推广试验以来，每年都以翻番的速度增长，１９９８年底拥有量已达５０３台。生产厂家也像“雨后春笋”一 1  status quo and existing problems (1) Combine harvesters due to the short history of the development, hybrid models, the hands of this new technology to understand less, thus increasing the difficulty of teaching. Wenling City since 1989 the introduction of the first KC-070-type combine harvester since the experiment has been doubled every year the rate of growth, by the end of 1998 has reached 503 units. Manufacturers are also like “springing up” one