... hard cash 硬币 hard chromium 硬铬镀层 hard currency area 硬通货地区 ...
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精密小孔在镀硬铬时，很难获得均匀的镀层，直接影响产品的尺寸精度和形位精度。
It is difficult to gain homogeneous coating when precision small holes are electroplated chrome, which affects the dimensional precision and the form precision of the product.
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