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气体渗氮技术
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气体渗氮技术
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gas nitriding technology
气体渗氮技术
在特定温度的渗氮气氛中长时间保温,使得氮原子渗入金属表面,以改变其成分、组织及结构,从而实现工件表面力学性能改善的工艺。
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Trailokya
trail pheromone
trails for fitness
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train advertisement
Train Aerodynamics
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Train Control and Management System
train control balise system
train control center
Train Doctor
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trainer
train formation
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Training
training
training and administration of archaeological personnel
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