(A) prevent the bulging of flat surfaces
(B) avoid explosion in furnace
(C) prevent leakage of hot flue gases
(D) support furnace freely from top
(E) prevent atmospheric air leaking into furnace
(A) prevent the bulging of flat surfaces
(B) avoid explosion in furnace
(C) prevent leakage of hot flue gases
(D) support furnace freely from top
(E) prevent atmospheric air leaking into furnace
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