An experimental test of bench mining in the high and dangerous slope of a certain open-pit mine was made.

在某露天矿山的高危边坡上进行了台阶采矿的试验研究。

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An experimental test of bench mining in the high and dangerous slope of a certain open-pit mine was made.

在某露天矿山的高危边坡上进行了台阶采矿的试验研究。

youdao