A.α適當(dāng)減小 B.減小煤氣熱值 C.多裝煤 D.交換周期增大
A.10 B.20 C.30 D.40
A.9-2 B.2-1 C.7-2 D.5-2
A.20% B.15% C.10%
A.2-1 B.5-2 C.9-2