无损硬度系数与梨的可溶性固形物也有较好的负相关性，酥梨、水晶梨、雪梨的相关系数分别为-0 .903、-0 .922和-0 .920。

The stiffness factor negatively correlated with SSC and the correlation coefficients were -0.903, -0.922 and -0.920 for Dangshan, Shuijing and Xue pears, respectively.

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这表面有极高的硬度（60局。），耐磨性和耐腐蚀性，低摩擦系数。

This surface has extreme hardness (60 RC. ), excellent wear and corrosion resistance, and low coefficient of friction.

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然而，在某些应用条件下，钛合金的硬度低，摩擦系数大，耐磨性差。

However, in some application conditions, low hardness, big friction coefficient and poor wear resistance confine its extensive application in engineering.

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