Carbide-tipped chaser is an important tool for the production ofpetroleum steel pipe.

硬质合金螺纹梳刀是油井管生产的重要工具。

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Carbide-tipped chaser is an important tool for the production ofpetroleum steel pipe.

硬质合金螺纹梳刀是油井管生产的重要工具。

youdao