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1·Load an arbitrary matrix to the current projection matrix.

加载一个任意的矩阵到当前的投影矩阵。

2·Applying this formula, almost all problems of present azimuthal projections could be covered and this formula may be applied to get arbitrary kind azimuthal projection as well.

应用该公式，几乎可以包括目前所有的方位投影，而且可以应用于探求任意性质的方位投影。

3·The theorem of projection of acceleration has been presented in this paper. According to the theorem, projection relation of acceleration of arbitrary two points on the plane figure is built.

本文提出了“加速度投影定理”，根据这一定理，建立了平面图形上任意两点加速度的投影关系。