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有道翻译

had been pp

曾经是。

以上为机器翻译结果,长、整句建议使用 人工翻译

双语例句

  • The cause of the increasing mechanical properties of PP composite materials, which were strengthened and toughened with organic rigid particles and elastomer, had been investigated .

    讨论了有机刚性粒子弹性体增强韧改性聚丙烯复合材料力学性能提高原因

    youdao

  • Mechanical properties of composite PP were tested, and also fracture analysis, XRD analysis; DSC analysis had been done to the composite PP.

    PP复合材料进行力学性能测试断口形貌观察、XRD结构分析DSC热分析等分析。

    youdao

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