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Rockwell
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HR c
Rockwell
C
标洛氏硬度
HRA
Rockwell
A
标洛氏硬度
HRb
Rockwell
B
标洛氏硬度
HRF
Rockwell
F
标洛氏硬度
North-American
Rockwell
Micro Electronics Co.
北美洛克威尔微型电子设备公司
美
Rockwell
hardness number
洛氏硬度〔数〕
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