Reinforced concrete and prestressed concrete tubes, pipes, rods, plates, piles and similar articles(whether or not reinforced) 钢筋混凝土和预应力混凝土管等(包括杆、板、桩等,无论是否加强),
Prefabricated structural components of cement, of concrete and artificial stone for building or civil engineering (whether or not reinforced) 水泥制建筑或土木工程用预制构件(包括混凝土或人造石制,不论是否加强),