Heat from burning fuel warms the walls of the firebox section of the furnace in
a. a hot-water heating system.
b. a hot-air heating system.
c. a compressor compartment.
d. an evaporation system.

Heat from burning fuel warms the walls of the firebox section of the furnace in

A. a hot-water heating system.

B. a hot-air heating system.

C. a compressor compartment.

D. an evaporation system.

the average speed is 24.57 km/hr

1 a

2 b

3 b

4 d

5 d

6 d

explanation: