| 抛掷量通常是指1全部抛掷量覆盖层抛掷进人先前采空区的全部数量 | castover commonly means either total castover the total amount of overburden cast into the previously mined pit, or 2 direct castover the amount of overburden cast into the previously mined pit that is in final location and does not have to be dug by the dragline |
