A-tube used for high density, high-elastic foam cores do, the high wear-resistant polyurethane surface coating materials, mainly used for clean up the pipeline, cleaning, and pipe investigation.
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They do some investigation and find two pieces of broken pipe.
他们做一些调查和发现坏掉的管二块。
Through the deep investigation and analysis of the drilling pipe failure, the main factors causing drilling pipe failure are found out.
通过对钻杆失效问题的深入调查和分析，找出引起钻杆失效的主要原因。
This paper sets up a simplified physical model for viscoelastic pipe, on which a investigation on energy dissipation mechanism of it is presented and some new conclusions are given.
建立了挠性胶管阻尼耗能的简化模型。以此为基础分析了挠性胶管的阻尼耗能的一般规律，并得出了一些新的结论。
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