你遇到问题了?太好了。为什么这么说呢?因为你每遇到一个问题并以积极的心态解决它,你就会变得更好、更成熟、更成功。在面对各种......

UHMWPE fiber (Dyneema) reinforced composites are an important class of materials for armors.These materials provide supe......

Jinchuan nickel mine is the largest nickel mine in China. Cut-and-fill mining method with high density cementing materia......

Gangue from underground separation of coal can directly be used for filling mined out areas, saving transport capacity a......

Based on the principle of fully mechanized backfilling and coal mining technology and combined with the Xingtai Coal Min......