论文部分内容阅读
煤矿工业建设,既需要较多的投资,又需要较长的时间,一个中型矿井由探勘至达到设计产量,一般说要六年到八年的时
The construction of coal mining industry requires more investment and requires a longer period of time. A medium-sized mine will be surveyed until it reaches the design output, generally speaking it will take six to eight years.