(A) to produce draught to accelerate the combustion of fuel
(B) to discharge gases high up in the atmosphere to avoid hazard
(C) to reduce the temperature of the hot gases discharged
(D) none of the above
(A) to produce draught to accelerate the combustion of fuel
(B) to discharge gases high up in the atmosphere to avoid hazard
(C) to reduce the temperature of the hot gases discharged
(D) none of the above
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