Also, two-page features and ads have a visible seam down the middle that rarely, if ever, matches up correctly.
此外，两页的特征和广告沿着中间有明显的结合，而且根本没有匹配正确。
From rock strength, the main seam roof is divided into extra-high intensity, high intensity, middle intensity, and low intensity.
从岩石强度方面把煤层顶板分成强度特高型、强度高型、强度中等和强度低型。
The Middle and Lower Jurassic with thick coal seam is widely distributed in Northwest China.
西北地区中、下侏罗统煤层广布，厚度较大；
The concrete construction methods and effects of mining technology in the middle thick coal seam are introduced.
介绍了中厚煤层回采工艺的具体施工方法和效果，同时介绍了工作面支护参数的计算。
The concrete construction methods and effects of mining technology in the middle thick coal seam are introduced.
介绍了中厚煤层回采工艺的具体施工方法和效果，同时介绍了工作面支护参数的计算。
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