projections投影图projectionn.投影；投射；规划；发射；凸出物；预测；放映projection property投影特性projection perimete投射式视野计projection equation投影方程projection eyepiece投影目镜PROJECTION AND VIEW投影与视图projection geometry射影几何学projection printing投影印刷projection of image投影projection profiles投影特征projection formulas投影定理