俏佳人天天看高清影院

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Brief introduction:The principle of using the cold upsetting steel reinforcement end plastic deformation。The actual cross-sectional area of the processed thread is larger than that of the original steel bar, which greatly improves the tensile strength of the joint. This thread upsetting after tensile test are broken in the base metal, which is suitable for the construction, Luqiao, high iron, high power engineering


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俏佳人天天看高清影院