coal mining

短语词组

短语

• coal -mining methods 采煤方法
• coal surface mining 露天采煤
• single coal seam mining 单一煤层开采
• coal resources mining 煤炭资源开采
• coal pillar mining 带煤柱开采
• coal mine mining 矿井开采
• coal caving mining 煤采煤;放顶煤开采;放顶煤
• opencast coal -mining 露天采煤
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