Analysis of the mechanism of coalbreaking by self-excited vibration water-jet; discussion on the influence of several parameters on pulverizing efficiency.
分析了自激振荡水射流超细粉碎系统对煤粉颗粒的粉碎机理，讨论了影响粉碎效率的几种因素。
2
The paper emphatically analyses the interaction between the wall stress characteristic and coal getting by impact on the longwall face, proposes the work pattern of coalbreaking by impact.
看重分析了长壁采煤工作面煤壁应力特点和冲击劈裂式采煤的相互作用关系，提出了冲击破煤的作业方式。
3
As for coal, it is fiendishly dirty: Britain will be breaking just about every green promise it has ever made if it is using anything like as much as it does today.