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  • The mechanical and metallurgical properties of tool joints made in West Germany, France, Brazil and China are thoroughly studied.

    本文对国产的和从西德、法国和巴西进口的钻杆接头作了解剖分析。

    youdao

  • The mechanical and metallurgical properties of tool joints made in West Germany, France, Brazil and China are thoroughly studied.

    本文对国产的和从西德、法国和巴西进口的钻杆接头作了解剖分析。

    youdao

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