【物理】预制混凝土梁（预制混凝土大梁)，横跨梁结构【建筑】预制混凝土横梁

Prefabricated buildings

prefabricated wall (precast wall)

equipment for making prefabricated members

prefabricated bulkhead

mould for prefabricated garages

prefabricated skin flap

prefabricated compound unit

for prefabricated unit (prefab element) at the road pavement construct