丘陵山区农业机械化发展的制约因素及对策--以重庆为例
구릉산구농업궤계화발전적제약인소급대책--이중경위례
The Restriction Factor and Countermeasure of Agricultural Mechaniza tion in Mountain and Hill Areas-A Case Study of Chongqing
저자의 최근 논문