extremely thick coal seam

 
  • 特厚煤层

extremely thick coal seam的用法和样例:

例句

  1. Introduced the prevention methods and practice experience for the sixth pit in Xingshang Coal Mine adopted longwall inclined slicing experence mining method.
    介绍了兴山矿六井采用倾斜分层走向长壁采煤法开采特厚煤层,防治自然发火的经验。

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