A drill assembly is typically a few tens of metres long and can only hold a core of ice of the same length.

一个钻取机通常有数十米长而且只能获取一个与之等长的冰芯。

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A mechanical model for the offset-axes pendulum drill assembly (OAPDA) was established according to the continuous beam theory and the d.

运用纵横弯曲连续梁理论和达朗伯原理，建立了偏轴钟摆钻具组合动力学分析模型。

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For now the 31-year-old plant manager is content to lord over a factory floor of Vermeer Manufacturing Co. in Pella, Iowa, pointing to a directional drill assembly line that used to be cluttered with 20 days' worth of parts inventory.

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The assembly of the drill to be used in Plan C has been completed, he said, adding that he hoped it would begin drilling this weekend.

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