Common fault and countermeasure of elementary mining in top-coal caving face with big dip and hard roof and thick seam
英
美
释义
大倾角坚硬顶板较薄厚煤层综放面初采常见事故及防范措施
把海词放在桌面上,查词最方便
触屏版
|
电脑版
©2003 - 2024 海词词典(Dict.cn)
立即下载