The furnace refractory in a boiler should be ___________ to prolong its life.

The furnace refractory in a boiler should be ___________ to prolong its life.

The furnace refractory in a boiler should be ___________ to prolong its life.





a. Wash coated with a dilute solution of heat resistant cement
b. Painted with heat resistant paint
c. Oiled
d. Wire brushed
e. Washed with a high-pressure hose





Answer: A


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