__Temperature of __________ can not be measured by an optical or radia – McqOptions

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1.	__Temperature of __________ can not be measured by an optical or radiation pyrometer.__
A.	Hot blast (air) from stoves
B.	Molten slag flowing out of blast furnace
C.	Combustion space in boilers
D.	Rotary limestone calcination kiln
Answer» B. Molten slag flowing out of blast furnace

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