单项选择题
A.5% B.10% C.15% D.20%
A.转炉煤气 B.荒煤气 C.净化后的焦炉煤气 D.高炉煤气
A.＞10mm B.＞20mm C.＞25mm D.＞60mm
A.10%-20% B.20%-30% C.30%-40% D.40%-50%
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