During the alternating transportation of product oil through pipeline, the flow rate of the oil changes with the moving of the mixed oil segment.
在管道顺序输送成品油过程中，随着混油段的移动，管内流量必然会发生变化。
Apart from power, the oil and gas industry is also emerging as a lucrative end-user segment, especially with the rise in exploration activities.
除了电力，石油和天然气行业也正在成为一个利润丰厚的最终用户领域，特别是伴随着勘探行动的增多。
The polyurethane (PU) is a polymer formed with urethane segment, as very high resistance to tear and abrasion, good resistance to ozone, oil and petrol, is widely used.
聚氨酯（PU）是一种具有氨基甲酸酯链段重复结构的聚合物，具有很好的耐撕裂和耐磨损性，良好的抗臭氧和耐油性，应用广泛。
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