ruler or string method
基线注尺寸法 basic line ; base-line dimensioning
基线尺寸法 Base Line Dimensioning
法线尺寸 Normals Size
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操作时采用空料线法(从炉顶打水)，回收高炉煤气，不安装特殊探尺，用风量判断料面行程。
During lowering charge level with water spraying into the blast furnace, the gas is recovered and the charge level is judged by the blast volume not by special stock rod.
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