磨损破损机理
mechanism of wear and failure
套损类型
the type of casing pipe damage
白垩纪复活型破火山
Cretaceous revived caldera
包壳破损探测
a back stationary flat system with suction device
爆破破坏分区
distinction of blasting crack zones
爆破破碎性能
explosion and crash property
爆破破岩
Blasting and fragmentation
Rock fragmentation by blasting
blasting rock-broken