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Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________?

/ Process Control and Instrumentation / By
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 B. or C.