partiality distance

The geometry and physics static characters of projectile is called projectile's static parameter, which includes the length, diameter, mass, center of mass, moment of inertia, partiality distance, wring moment and so on.
弹箭静态特征的几何量和物理量统称为弹箭的静态参数。 它包括弹长、弹径、质量、质心、转动惯量、偏心距、扭矩等等。