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1.Introduction

Based on research backgrounds and significances,Chapter One summarized current study status of production risks in coal mining,and pointed out its prime problem.Thus the basic frameworks,ideas,approaches and contents of this study were analyzed,with proposal of related technique route. l+9D1vOQMHcERvH6bwZZnBoKSK7Vs2omNU2NzgoreguvM6e6bIY0cJGtGProv3uM

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