这些属性包括物体的密度和摩擦力。
These attributes include the density of the object and the friction.
随着裂隙密度参数的增加，变形模量有减小的趋势；随着裂隙摩擦系数的增加，变形模量有逐渐增加的趋势。
For the deformation of fractured rock mass, crack density parameter and crack friction coefficient are the most important parameters.
低密度石墨的摩擦系数和体积磨损量比高密度石墨材料高。
The low density graphite gets higher friction coefficient and bulk worn loss than the high density graphite.
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