对未充水和充水管道中纵向模态的传播特性进行了研究。
Propagation characteristics of longitudinal modes in pipes filled with and without water were investigated theoretically.
本实用新型公开了一种水压管道疏通器，它由充水管、进水管、椭球型胶囊组成。
The utility model discloses a water-pressure pipeline dredger, which comprises a water filling pipe, a water inlet pipe, and an elliptical ball-shaped capsule.
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