inscribed quadrangle

Discussed are the affine equivalence problems about the oval and its inscribed and externally tangent polygon.

讨论了椭圆及其内接、外切n边形的仿射等价问题,给出了椭圆及其内接、外切n边形与圆及其内接、外切正n边形仿射等价的必要条件和充分条件。

Blocking die and extruding die for manufacturingan inner joint were designed.

提出了采用预成形和正反挤成形生产内接头新工艺 ,通过有限元模拟和分析确定了合理的预制坯形状和尺寸 ,设计了内接头预成形和正反挤成形模具。

Test for Tumorigenicity of Cells by Soft Agar Cloning Method and Inoculation in Nude Mice;

软琼脂克隆法与裸鼠体内接种法检测细胞致瘤性的比较