• The drill bit body has three wings four cylindrical tungsten carbide inserts and curved slots for removal of cuttings.

    结构上采用齿的钻头形排粉沟槽,适用于硬、中、软岩的三种齿形。

    youdao

  • The removal of national industries in the coastal area to the inland area and the construction of the industry base in the wings are great pictures in the history of Anti-Japanese war.

    沿海沿江地区民族工业大举内建设后方工业基地,写下抗战史上悲壮而光辉的一页。

    youdao

  • The removal of national industries in the coastal area to the inland area and the construction of the industry base in the wings are great pictures in the history of Anti-Japanese war.

    沿海沿江地区民族工业大举内建设后方工业基地,写下抗战史上悲壮而光辉的一页。

    youdao

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