| http://www.w3.org/ns/prov#value | - In accordance with the method of preparing the porous structural unit of the first invention which comprises a step of putting a material including resin particles in a space formed by first and second metal mold halves, a step of imparting a temperature difference between the first and second metal mold halves, a step of pressing the material with the metal mold halves and a step of heating at le
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