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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
Automobiles1
Aviation1
Electric machinery1
Metallurgy1
Space1
Technology2

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