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to phrases
nitrogen case hardening
space
渗氮
tech.
表面渗氮淬火
nitrogen case-hardening
auto.
氮化硬化
avia.
渗氮
el.mach.
渗氮硬化
tech.
渗氮表面硬化
nitrogen case hardening:
1 phrase
in 1 subject
Metallurgy
1
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