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随着对外贸易的发展,我国与日本在产品和铸件方面的贸易随之增多。由于目前我国尚无一套完整统一的铸件尺寸公差标准,而民品和外贸产品一律采用航标就很难取得好的经济
With the development of foreign trade, trade between China and Japan in products and castings has increased. Since there is no set of uniform and uniform casting size tolerance standards in China, it is very difficult to obtain a good economy for civil products and foreign trade products that use beacons.