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hardness penetration
construct. 淬硬〔淬火〕深度
met. 淬硬深度
plast. 硬化深度
tech. 钢材的硬化深度; 硬化度; 淬火深度; 淬化深度
wind. 淬透性
hardness penetration: 4 phrases in 2 subjects
Metallurgy1
Technology3