A.40-45° B.45-50° C.50-55° D.55-60°
A.鑄鐵式非沸騰 B.鑄鐵式沸騰 C.鋼管式非沸騰 D.鋼管式沸騰
A.結構簡單,故障少 B.金屬耗量小 C.對煤中雜質不敏感 D.可研制無煙煤