F1在xyz轴投影分别为:-0.5F1,-0.5F1,0.707F1F2在xyz轴投影分别为:0.707F2,0,0.707F2F1对xyz轴的矩分别为:0.707aF1,-0.707aF1,0F2对xyz轴的矩分别为:0.707aF2,0,-0.707aF2