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随着科学技术的发展,越来越多的工业产品向微型化和精密化发展,在产品零件中出现了大量形状各异的微细结构,其中金属板微小孔结构占很大一部分比重,在工业领
With the development of science and technology, more and more industrial products have been developed towards miniaturization and precision. A large number of fine structures with various shapes appear in the product parts. The micro-hole structure of the metal plate accounts for a large part of the proportion. In the industrial collar