In order to study and improve the stability and reliability of the mast of rotary drilling rig in the course of construction, in this paper, three-dimension
As an indispensable part of transportation system, urban underpass can alleviate traffic congestion and reduce traffic accidents effectively. In order to ac
For an explosive source used in seismic exploration, evaluating its seismic wave energy caused by explosives exploding in the soil is an important issue. Th