_ The concept of overall coefficient of heat transfer is used in heat transfer problems of$?

_ The concept of overall coefficient of heat transfer is used in heat

1.	_ The concept of overall coefficient of heat transfer is used in heat transfer problems of$?
A.	Conduction
B.	Convection
C.	Radiation
D.	Conduction and convection
Answer» E.

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_ The concept of overall coefficient of heat transfer is used in heat transfer problems of$?

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