longwall mining

常见例句

This is the beginning of longwall mining.
這是長壁開採的開始。
Analyses the factor that effect on the percentage of recovery in longwall mining with caving coal face, approaches the access to raise the percentage of recovery.
分析了影響綜採放頂煤廻收率的因素，探討了提高廻採率的途逕。
Based on the model of mechanics, some functional formulae of strata and surface movement above longwall mining goaf are derived by using the displacement method of theory of elasticity.
本文在力學模型的基礎上，利用彈性理論的位移函數法導出了長壁採煤法採空區上方巖層及地表移動的函數表達式，同時給出了巖層及地表最大移動值的計算公式。