[tex=7.714x2.214]4Oe8mR7iPE47KmwxQzpkZrvo6AIWRrlFO/vC+Kk0W/k=[/tex][tex=4.786x1.286]EDFTY8tzk9x3A/nBOVhPsg==[/tex][tex=4.071x1.286]1gOW9H87bkDX3sLvtbEElg==[/tex]，其中[tex=7.714x3.357]4KhdWFjWHLuwm/E4dVkdLgJVvbmAPrgGa+B52NAj5Up4Sk60bdCne0rMEKUTBIUXXTT0BXY1ED6m/vSjQ8rBD7Ywj5wi1V+rEA/CoWVB1Ms=[/tex]，从[tex=0.5x1.286]asctJDWpGaq/ETe64ANZ1Q==[/tex]轴正向望下看，[tex=0.714x1.286]LA74ioWWkXdGbHCtFk/Sog==[/tex]为顺时针方向 .
[tex=7.714x2.214]4Oe8mR7iPE47KmwxQzpkZrvo6AIWRrlFO/vC+Kk0W/k=[/tex][tex=4.786x1.286]EDFTY8tzk9x3A/nBOVhPsg==[/tex][tex=4.071x1.286]1gOW9H87bkDX3sLvtbEElg==[/tex]，其中[tex=7.714x3.357]4KhdWFjWHLuwm/E4dVkdLgJVvbmAPrgGa+B52NAj5Up4Sk60bdCne0rMEKUTBIUXXTT0BXY1ED6m/vSjQ8rBD7Ywj5wi1V+rEA/CoWVB1Ms=[/tex]，从[tex=0.5x1.286]asctJDWpGaq/ETe64ANZ1Q==[/tex]轴正向望下看，[tex=0.714x1.286]LA74ioWWkXdGbHCtFk/Sog==[/tex]为顺时针方向 .
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