Besides such objective conditions as the thickness of coal bed, faint awareness of treasuring resources,lack of supervision,and deficiency in management r...

• 分析原因,除客观条件(如煤层厚度)等因素外,生产单位珍惜资源的意识淡漠,监管缺位和管理制度缺陷都在很大程度上影响了回采率的提高。