5. The diameter of the new tungsten steel upper knife is 68mm, each time it is grinded 0.5mm, five times it is grinded. If the diameter is less than 65.5mm, it will be discarded. If the thickness of the tungsten steel lower knife is 3.5mm, each time it is grinded 0.1mm, five times it is grinded, and if the thickness is less than 3.0mm, it will be discarded.<br>
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