... 木质磺酸铬 chrome lignosulphonate 硼粉 boron metal powder 酮康唑 ketoconazole ...
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Small amounts of boron were transferred from the electrode to weld metal by adding boron oxide or ferroboron powder to the electrode covering.
通过在焊条药皮中加入氧化硼或硼铁向焊缝渗入微量硼。
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