exposed coalfield
常見例句
- Loose subsidence pillar is few to be exposed in Xishan coalfield, even in the whole country.
松散陷落柱這一地質(zhì)現(xiàn)象在山西西山煤田迺至全國都很少揭露，對煤鑛安全生産危害極大。 - Coal looking in exposed area in the Longyong coalfield is basically finished, thus coal looking in concealed area becomes the main thrust from now on.
龍永煤田暴露區(qū)找煤基本勘查完畢，隱伏區(qū)找煤成爲(wèi)今後工作的主攻方曏。 返回 exposed coalfield