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Determination of reasonable mining mode for the first phase of gently inclined coal seam .................................... Department of Mining Zuo Xiufeng Zhang Xianchen (1) Optimization of working line length of open pit mine ....................................... ... Department of Mining in Ru Shou Xi Yongfeng (14) Probability thick grading sieve and its industrial applications ... ... Northeast Institute of Technology Wen Bang Chun (29) optimal tree algorithm in the rod analysis In the should