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 every piece, the stiff, hollow pipes that connect the drill assembly with the rig at the surface have to be assembled as the drill is lowered and dismantled when it comes up again.

每一段坚实、中空的连接钻取机索导管的冰芯只能被切碎，因为钻取机再次出来时变得更低了也更细了。

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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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