亲妹妹的阴道口

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                Selection of standard materials

                Apr-15,2021 2636

                1. Requirements for the mechanical properties of the standard parts and materials, especially the strength;   

                2. The requirements of working conditions on the corrosion resistance of materials;   

                3. The requirements of the working temperature on the heat resistance of the material (high temperature strength, oxidation resistance);   

                4. Requirements for material processing performance in terms of production technology;   

                5. Other aspects, such as weight, price, and purchasing factors, must be considered.



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