ultrasonic pulse reflection method
ultrasonic pulse reflection method
超声波脉冲反射法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Acoustic velocities of tap water and polymer solution were studied using ultrasonic-pulse reflection method in the laboratory. Polymer density and apparent viscosity were measured.
采用脉冲反射法在实验室条件下对自来水和不同浓度聚合物溶液的声速进行了测量研究，经测量得到了聚合物溶液的密度、表观粘度。
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