The Distinct Element Method(DEM)is a discontinuum-based numerical method especially applicable to solve the discontinuity problems in jointed rock mass.

离散元法是基于不假设的数值方法,它特别适合于求解节理岩体中的非题。

The relationship between continuity and discontinuity is antinomy and untie.Discontinuity is the plentitude condition to continuity.Continuity will not exist with discontinuity.

间是的充分条件，没有间就没有，不存在没有间的。

According to the problem of position discontinuity using GPS in city cars, a scheme that GPS is combined with DR which is composed by piezoelectric gyro and milemeter is put forward.

针对城市车辆全球定位系统(GPS)定位存在的不题,提出了采用压电陀螺和里程仪组成的低成本航迹推算系统与GPS组合方案。