Through surmounting solves the technology knotty problem of retrieving coal column of mining area with the systemmechanization mining technique. By application in mining process the effect is better.
通过攻关，解决了综采工艺回收盘区煤柱的技术难题，经过在开采过程中的应用，效果良好。
2
Mechanization is the result of electrical and radioactive tones of creation in a magnetic system, which creates straight-line movement.
机械化是电性及辐射性造物音调在磁性系统中的结果，它创造了直线运动。
3
First, the status quo has been discussed from the aspects of agricultural machinery, the mechanization level and the service system.