铰刀的精度是以胎具的制造精度为基础。
它的设计与制造精度直接影响着压气机的性能。
Its design and manufacture precision have large effect on the performance of compressor.
船用螺旋桨是一类典型的自由曲面零件，它的设计和制造精度直接决定了其推进效率。
Marine propeller is a type of free form surface part. Its design and manufacture precision decide ship's thrust efficiency directly.
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