Center back seam with offset hem.
中心偏移下摆焊缝背面。
Roof control is key management of opening up coal seam with potential outburst in crosscut.
顶板管理是石门揭露突出煤层过程中的管理重点。
Effects of welding parameters on the penetration of austenitic stainless steel A-TIG weld seam with the home-made active flux were carried out.
利用自制的活性剂,考察了焊接工艺参数对奥氏体不锈钢A-TIG焊焊缝熔深的影响。
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