upward mining 中文意思是什麼
upward mining
解釋
上向采礦-
The upward horizontal slice stoping and filling without intervening pillar is the main mining method in huangshaping pb - zn mine
摘要上向水平分層充鎮無間柱采礦法是黃沙坪鉛鋅礦的主要采礦方法。 -
But the upward spiral is also being fuelled by conservative planning prices among mining companies which have held back mining investment, say analysts and hedge fund managers
但分析人士和對沖基金經理們表示，價格螺旋式上升的根源之一，是礦業公司保守的規劃價格，這種做法抑制了采礦投資。 -
Practice and research on upward mining of fully mechanized coal mining face
大同礦區綜采工作面上行開采技術實踐
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