| http://www.w3.org/ns/prov#value | - As the aggregate, in addition to sand, gravel, water granulated slag, recycled aggregate, and the like, refractory aggregates such as silica aggregate, argillaceous aggregate, zircon aggregate, high alumina aggregate, silicon carbide aggregate, graphite aggregate, chromium aggregate, chrome-magnesite aggregate, and magnesia aggregate may be used.
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