steep coal seam的意思|示意

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steep coal seam相关短语

1、 steep coal-seam 急倾斜煤层

2、 steep dip coal seam 急斜煤层

3、 steep thick coal seam 大倾角厚煤层

4、 steep soft coal seam 急倾斜松软煤层

5、 steep-inclined coal seam 急倾斜煤层

6、 steep-inclined thick coal seam 急倾斜厚煤层

7、 top coal in steep seam 急倾斜煤层放顶煤

8、 steep-inclined super-thick coal seam 急倾斜持厚煤层