preparation technique of column
preparation technique of column
色谱柱制备技术
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The present invention relates to an H-shaped steel specialized for the supporting column of the contact net of the electrified railroad and the preparation technique thereof.
本发明涉及一种电气化铁路接触网支柱专用H型钢及其制备工艺。
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