(A) from a metal wall from one medium to another
(B) from heating an intermediateanaterial and then heating the air from this material
(C) by direct mixing
(D) heat is transferred by bleeding some gas from furnace
(E) none of the above
(A) from a metal wall from one medium to another
(B) from heating an intermediateanaterial and then heating the air from this material
(C) by direct mixing
(D) heat is transferred by bleeding some gas from furnace
(E) none of the above
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