Ecological and environmental questions caused by closure of large-scale of open pit coal mine and the way of dealing with it刘志斌1-3
Leakage Reasons and Protective Measures during Installation Engineering for Pipes of Central Heating and Washroom杨志国, 解爽, 孙锡生18-20
Analysis and Countermeasures for Wear and Tear of Walking Parts on Large Scale Caterpillar Bulldozers赵军, 吴树彬, 夏成泉, 郭翠珍21-22,27