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Psb hrb npr钢筋是什么意思？psb是预应力混凝土用螺纹钢筋 (也称精轧螺纹钢筋)的英文（ prestressing、 screw、bars )缩写。预应力混凝土用螺纹钢筋以屈服强度划分级.
The week in 33 photos CNN
Npr Journalists David Gilkey Zabihullah Tamanna Killed In Afghanistan Journalist And Translator By Taliban The
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