At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议.This article is good for promotion of backfill.本文对充填技术的推广,具有一定的参考价值.The upward drift stoping with backfill is a mining method with ...
At last, some suggestions were raised for the concrete backfill mining.最后对具体的充填开采方法提出了建议.This article is good for promotion of backfill.本文对充填技术的推广,具有一定的参考价值.The upward drift stoping with backfill is a mining method with ...
The Hopi people want it back because it is sacred to them.霍皮人想要回去,因为它对他们而言是神圣的.Once again, the Hopi present an interesting contrast.霍皮人再一次提供了有趣的对比.But in Hopi, locations or regions of space cannot function by themselves ...
The $ 87 , 000 Fisker Karma plug - in luxury hybrid is scheduled to begin production late this year.售价87000美元的美国fisker汽车公司的Karma将在2009年如期开始生产.Indeed, experience with the legislatively imposed hybrid procedures has not be...
A sink brims with water. You pull the plug The water stirs . A vortex materializes.满满一盥洗槽的水, 当你拔去水槽的塞子,水就会开始搅动....the spiralling vortex airflow that slows the plane.使飞机减速的螺旋形气流涡旋The polar vortex is a system of wintertime...