| http://www.w3.org/ns/prov#value | - On this occasion, as the platform, a platform comprising, as a raw material, any one of quartz glass doped with a metallic element, graphite, alumina ceramics, zirconia ceramics, ceramics containing alumina and zirconia, and other ceramics, or another platform prepared by combining any one of these raw materials and quartz glass is favorably used.
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