It is emphasized that units of the mill for high (medium ) frequency treatment, ultrasonic detection, shearing/butt-welding and .o.f.oll forming have to be imported,while...

• 指出除高（中）频热处理、超声波探伤、剪切对焊及排辊成型等设备可以引进外，飞切机、水平螺旋活套、水压机和平头倒棱机等都可以实现国产化。