Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________?
(A) Chromel-alumel thermocouple
(B) Optical pyrometer
(C) Radiation pyrometer
(D) Either
Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________?
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