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简介:     防撞护栏主要有内外两方面原因。外因是钢材需求低迷、价格大幅下跌,原燃料特别是铁矿石价格下降幅度低于钢材,且在时间上不同步。7、8份铁矿石价格下降时间明显滞后于钢材,而在9份钢材价格略有反弹时
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