冷硬铸铁;硬铁
The compass deviation is composed of hard iron error, soft iron error and alignment error in this thesis.
三轴磁强计的罗差主要包括硬铁误差、软铁误差和对准误差。
retrieving metal materials by means of disused hard iron-bounded alloy
酸溶法从铁基硬质合金中回收金属材料
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