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to phrases
nitrogen hardening
auto.
氮化
处理
el.
渗氮硬化
处理
;
渗氮
met.
渗氮硬化
steel.
氮化
tech.
钢表面氮硬化处理
nitrogen hardening
:
7 phrases
in 6 subjects
Automobiles
1
Aviation
1
Electric machinery
1
Metallurgy
1
Space
1
Technology
2
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