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F= Xi Ye+ XeYi F=XeYi-Xi Ye F= XiYi +XeYe F= Ye- Y i
states conditions situations positions
What a dangerous scene What dangerous a scene How a dangerous scene How dangerous the scene
How dangerous the situation What dangerous a situation How a dangerous situation What a dangerous situation
that, how it , what this, what it, how
How dangerous the scene What dangerous a scene How dangerous a scene What a dangerous scene
斜线终点坐标(Xe,Ye),当︱Ye︱>︱Xe︱时,计数方向取GY 斜线终点坐标(Xe,Ye),当︱Xe︱>︱Ye︱时,计数方向取GY 圆弧终点坐标(Xe,Ye),当︱Xe︱>︱Ye︱时,计数方向取GY 圆弧终点坐标(Xe,Ye),当︱Xe︱<︱Ye︱时,计数方向取GY
How dangerous the scene What dangerous a scene How a dangerous scene What a dangerous scene
What a dangerous scene What dangerous a scene How a dangerous scene How dangerous the scene
What a dangerous scene What dangerous a scene How a dangerous scene How dangerous the scene