Holding other license such as mechanical work, welding, pressure vessel, etc is preferred.
持有别的证书如机械、电焊、压力容器证书是优先的。
Of course, they also use mechanical fasteners and welding.
当然，他们同时也使用机械扣件和焊接。
Knowledge about machine maintenance (electrical, mechanical...), welding and machining.
机器维护相关知识(电子，机械……)焊接和机加工。
Which is composed of mechanical system, hydraulic system, electrical control system and welding system.
该生产线由机械、液压、电气控制及焊接四大系统组成。
Which is composed of mechanical system, hydraulic system, electrical control system and welding system.
该生产线由机械、液压、电气控制及焊接四大系统组成。
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