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本节难点：钻柱失效机理分析。
Section difficulty:Mechanism analysis of column out of work.
youdao
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钻柱共振是引起深井钻具失效的主要原因。
Drill string resonance is the major cause of drill tool failure.
youdao
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钻柱共振是引起深井钻具失效的主要原因。
Drill string resonance is the major cause of drill tool failure.
youdao