So, how studies can accurately prediction to the ducted propeller hydrodynamic performance is more important.

所以, 研究如何能更准确地预报导管螺旋桨水动力性能非常重要.

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EC - 135 Eurocopter helicopters combined with the low noise ducted propeller end of patented technology.

EC-135直升飞机结合欧洲直升机公司的低噪音涵道尾螺旋浆专利技术.

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