ConcreteTech Tsieina
From March 26, 2022 until March 28, 2022
Yn Beijing - Canolfan Arddangosfa Ryngwladol Tsieina, Beijing, Tsieina
Postiwyd gan Treganna Fair Net
http://www.concretetech.org/english/index.asp
categorïau: Sector Adeiladu, Sector Peirianneg
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