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921A球扁鋼中頻彎曲和熱處理技術條件

Specification for bending and heat-treatment of 921A bulb flats by means of MF induction
標準號:CB/Z 181-1998
Specification for bending and heat-treatment of 921A bulb flats by means of MF induction
標準號:CB/Z 181-1998