短語詞組短語Mine workings firmness 井巷穩(wěn)固性detail survey for mine workings 礦井工程碎部測量ground plan of mine workings 礦山巷道底面圖water burst in mine workings 礦井突水three -dimension mine workings 三維井巷Three -dimension underground mine workings 三維井巷 返回 mine workings