204. Magnesite bricks have poor resistance to attack by __________ slag.
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205. Periclase is
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206. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
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207. Fireclay bricks are not used in the
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208. Tar dolomite bricks are used in the
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209. The highest melting pure oxide (m.p. > 3000°C) is
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210. Porosity of silica bricks varies from __________ percent.
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