underground mining

短语词组

短语

• underground col mining 地下采煤
• underground coal mining 地下采煤
• underground E mining 地下开采
• Underground melting mining 地下热熔开采
• underground d mining 地下采矿
• underground coal mining method 地下采煤方法
• underground bench mining 井下梯段采矿法
• underground trackless mining vehicle 地下无轨采矿车辆
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