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钝化处理 dùnhuà chǔlǐ
auto. immunization
el.mach. passivation treatment
met. passivating treatment
steel. passivation
钝化处理形成保护膜 dùnhuà chǔlǐ
shipb. passivating
钝化 处理
: 8 phrases in 3 subjects
Metallurgy4
Oil / petroleum2
Technology2