钻杆接头材料35CrMo硫氮复合处理层的干摩擦学性能研究
찬간접두재료35CrMo류담복합처리층적간마찰학성능연구
Study on Dry Biological Properties of Drilling Pipe Joint Material with 35CrMo Sulphurized-nitrided Compound Layer
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