To improve the measuring precision of the automobile caster by a linear model on the four-wheel aligner, a precise measuring model was built. 摘要针对四轮定位仪采用线性模型测量主销后倾的误差问题，建立了精确的测量模型。
Through a typical quantum measurement model, we study the relation between decoherence of a central two-level system and quantum phase transition in its environment. 通过一个典型的量子测量模型，我们研究了一个二能级系统的退相干与和他耦合的环境的量子相变之间的关系。
