coal mining

短语词组

短語

• coal -mining methods 採煤方法
• coal surface mining 露天採煤
• single coal seam mining 單一煤層開採
• coal resources mining 煤炭資源開採
• coal pillar mining 帶煤柱開採
• coal mine mining 鑛井開採
• coal caving mining 煤採煤;放頂煤開採;放頂煤
• opencast coal -mining 露天採煤
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