矿床开采中露天与地下的联合开采法得到了广泛的应用。

The combined oPen pit and underground mining system has found wide application in depeit mining.

youdao

矿床开采中露天与地下的联合开采法得到了广泛的应用。

The combined oPen pit and underground mining system has found wide application in depeit mining.

youdao