The goving equation about steady flow of viscoelastic fluids in an eccentric annulus with inner rod moving axially is es......

卫星轨道及卫星导航定位都涉及很多几何问题,那么怎样用几何学解决卫星轨道及导航定位的计算是在实际应用中面临的一个重要课题.在......