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L型优质钢
met. steel type L
L 型优质钢
met. steel type L (【技】非金属杂质和残余元素含量低，抗内氧化性能优良，用作食品容器的优质钢。)
D型优质钢
met. steel type D
D 型优质钢
met. steel type D (【技】用铝脱氧，深冲用优质钢。)

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