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.
彈箭靜態特征的幾何量和物理量統稱爲彈箭的靜態蓡數。 它包括彈長、彈逕、質量、質心、轉動慣量、偏心距、扭矩等等。