井字形轨道梁
rail girdersof intersecting parallel pattern
新轨道梁梁型
new-prototype guideway girder
赤道轨道卫星
satellite equatorial orbit
磁悬浮轨道梁
magnetic levitation railway girder
magnetic suspension track beam
灌注桩轨道梁基础
track beam foundation of cast-in- situ concrete pile