The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?
(A) Chromel-alumel
(B) Iron-constantan
(C) Platinum-platinum/rhodium
(D) None of these
The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an _____________ thermocouple?
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