球面坐标系中的体积元素
volume element in spherical coordinate system
超球体体积和面积
the volume and the area of a super-ball
幂强化材料和超弹性材料组合的球体
sphere composed of a power hardening material and a hyperelastic material
sphere composed of a power hardening material and
碗盖球的球铰支座
spherical joint support of a bowl-capped ball