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洛氏硬度值
met.
Rockwell figure
;
Rockwell hardness figure
;
Rockwell
hardness
number
oil.proc.
Rockwell hardness number
shipb.
Rock well hardness number
wind.
Rockwell hardness scale
;
Rockwell number
洛氏硬度值
:
3 phrases
in 2 subjects
Aviation
2
Metallurgy
1
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