quarter octagon steel是什么意思，quarter octagon steel的翻译，quarter octagon steel音标、读音、用法和例句

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quarter octagon steel是什么意思，quarter octagon steel的翻译，quarter octagon steel音标、读音、用法和例句_伍贰汉英词典

quarter octagon steel

基本解释

专业释义

能源科學技術