High performance and high efficiency automobiles require structural alloy steels to be improved both in strength and service life.
汽车的高性能化需要高强度和长寿命的合金结构钢。
High performance and high efficiency automobiles require structural alloy steels to be improved both in strength and service life.
汽车的高性能化需要高强度和长寿命的合金结构钢。
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