【物理】预制混凝土梁（预制混凝土大梁)，横跨梁结构

ceiling, rib-span form

rib-span form, form;for coffered eilings

supporting, form for coffered ceilings (coffered ceiling boarding), rib-span form

rib reinforcement form for coffered ceilings, rib-span form

form for coffered ceilings, rib-span form

rib-span form, form of coffered ceilings

form for coffered ceilings (coffered ceiling boarding), rib-span form

rib-span form (rib-span shuttering)