Warning: file_put_contents(/www/wwwroot/ppbbu/bieo.cn/cache/211e9de7b4ef186f9ea91489bb00db1b.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/bieo.cn/index.php on line 58 underwall例句_underwall英汉例句_underwall双解例句_衣物护欧路词典
By alternately disposing along vein and underwall outside-vein raises and designing new structures for runoff tracks,rib pillars can be stoped in step with chambers. 简述了官地银金矿传统浅孔留矿采矿法应用中存在的突出问题,即间柱滞后矿房回采,且占有矿量多,造成地压集中显现。