Boiler ______ is the term used to describe the airtight metal casing of a boiler wall.

Boiler ______ is the term used to describe the airtight metal casing of a boiler wall.

Boiler ______ is the term used to describe the airtight metal casing of a boiler wall.



A ) wall
B ) metal
C ) casing
D ) house



Answer: C


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