Mine workings firmness的意思|示意
美 / /
英 / /
矿井工作面坚固度
Mine workings firmness的网络常见释义
井巷稳固性 ... 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 ...