mine workings

短语词组

短语

• Mine workings firmness 井巷稳固性
• detail survey for mine workings 矿井工程碎部测量
• ground plan of mine workings 矿山巷道底面图
• water burst in mine workings 矿井突水
• three -dimension mine workings 三维井巷
• Three -dimension underground mine workings 三维井巷
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