projections投影图projectionn.投影；投射；规划；发射；凸出物；预测；放映projection Ektar lens艾克塔摄影透镜Projection Microscopy显微投影法projection arithmetic投影算法projection evaluation项目评价projection attachment投影附加器projection distortion投影变形projection properties投影特性projection coordinate投影坐标projection microscope投影显微镜projection comparator光学投影比较仪,投影比较器

1. This paper concerns the ratio of centro-affine invarients for a projection body.
   摘要本文研究了关于投影体的中心仿射不变量比的问题。