A.定期更换 B.一年更换 C.坏了再换
A.5℃ B.10℃ C.15℃
A.8% B.10% C.12%
A.烟煤喷吹 B.配煤喷吹 C.粉煤喷吹 D.直接喷吹
A.6% B.8% C.10% D.14%
