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Rockwell hardness number
gen.
洛氏硬度〔数〕
avia.
洛氏硬度数
oil.proc.
洛氏硬度值
tech.
洛氏硬度
Rockwell Hardness Number
earth.sc.
洛氏硬度〔值〕
Rockwell hardness number:
1 phrase
in 1 subject
Metallurgy
1
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