研究了太阳能集热铜片和铜管的超声波缝焊机理。

The mechanism of ultrasonic seam welding of copper plates and tubes for collecting solar energy was investigated.

youdao

研究了太阳能集热铜片和铜管的超声波缝焊机理。

The mechanism of ultrasonic seam welding of copper plates and tubes for collecting solar energy was investigated.

youdao