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单词 scratch hardness
释义

WordReference Random House Unabridged Dictionary of American English © 2024
scratch′ hard′ness, 
  1. Metallurgyresistance of a material, as a stone or metal, to scratching by one of several other materials, the known hardnesses of which are assembled into a standard scale, as the Mohs' scale of minerals.
  • 1925–30

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