The rail flash butt welding machines are widely used in continuous welded rai ltrack in our country, but they are mainly imported abroad.

　
英 美
  • 我國主要依靠引進(jìn)國外鋼軌閃光焊機進(jìn)行焊軌生產(chǎn)和無(wú)縫線(xiàn)路鋪設施工,而具有全部自主知識產(chǎn)權的國產(chǎn)鋼軌閃光焊機目前尚屬空白。
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国内精品美女A∨在线播放xuan