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简述了冷镦和冷挤压用钢国家标准修订说明中的一点儿问题。
Describe some questions of the national standard modification statement of steel for cold heading and cold extruding.
youdao
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简述了冷镦和冷挤压用钢国家标准修订说明中的一点儿问题。
Describe some questions of the national standard modification statement of steel for cold heading and cold extruding.
youdao