| http://www.w3.org/ns/prov#value | - Further, in a case where the precursor sheet 3 a is made of a thermosetting resin or a thermoplastic resin, in order to control a thermal expansion coefficient of the insulation layer 3, and in order to increase mechanical strength, it is preferable to use a material made by: adding a filler such as aluminum oxide, silicon oxide, titanium oxides barium oxide, strontium oxide, zirconium oxide, calc
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