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.
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.
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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