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approaching flow system
接近流系统
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Particles of polypropene, with densities approaching that of water were used as tracer in the water system for the investigation of the flow characteristics.
在观察水在管内的流动特性试验中，用聚丙烯颗粒作为示踪粒子，其密度与水非常相近。
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