We need a short drill collar.

需要一根短钻铤。

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We need a short drill collar to put here.

这里要接一根短钻铤。

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The failure of collar connection thread is one of the prime drill tool failures.

石油钻铤螺纹联接失效是钻具失效的主要类型。

youdao

The failure of collar connection thread is one of the prime drill tool failures.

石油钻铤螺纹联接失效是钻具失效的主要类型。

youdao