Warning: fopen(/www/wwwroot/www.wendadaohang.com/data/md5_content_title/ab/ab7e66aee1ff8b4bb6f6d2a1be69d88d.txt): failed to open stream: No space left on device in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2468

Warning: flock() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2469

Warning: fclose() expects parameter 1 to be resource, bool given in /www/wwwroot/www.wendadaohang.com/inc/function.php on line 2475
煤矿用炮采掘进,掘进一米需要多少雷管和炸药,巷道5m×2.8m - 88问答网

煤矿用炮采掘进,掘进一米需要多少雷管和炸药,巷道5m×2.8m

如题所述

第1个回答  2016-03-30
要看是煤还是灰岩,煤的话大概是8公斤炸药和20个雷管。
相似回答