A.定期更換 B.一年更換 C.壞了再換
A.5℃ B.10℃ C.15℃
A.8% B.10% C.12%
A.煙煤噴吹 B.配煤噴吹 C.粉煤噴吹 D.直接噴吹
A.6% B.8% C.10% D.14%