实验结果表明，圆周积分投影和圆周梯度积分投影曲线具有良好的旋转和尺度不变性。
The experimental result shows that the curves corresponding to circular integral projecting and circular grads integral projecting own excellent steadiness when target rotates and flexes.
克普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
Newton's law of gravity; Gravitational force from a shell; Hooke's 'law'.
开普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
Kepler's 3rd law for circular orbits; Building up the shell-force by integration; Spring gun.
开普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
Kepler's 3rd law for circular orbits; Building up the shell-force by integration; Spring gun.
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