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並前往https://osha.oregon.gov/pubs/newsletters/constructiondepot/OSHAConstructionDepot/2015/01/how-to-ring-text-a-grinding-wheel.html

How to "ring test" a grinding wheel - Oregon OSHA

Grinding wheels must be inspected and "ring-tested" before they are mounted to ensure that they are free from cracks or other defects.

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