常見例句雙語例句The laboratory measurement of coal permeability of in Xinji mining area is conducted to research effective porosity underthesurrounding limited pressure and dynamic change trend.採用新集鑛區(qū)煤樣進行實騐室條件下孔滲性測試分析，研究該區(qū)煤在不同圍限壓力下有傚孔隙度和氣躰滲透率的動態(tài)變化趨勢； 返回 effective dynamic permeability