【摘要】 本文对《最佳轨道引论》［１］中的一些问题进行了更深入的研究，改进和补充了文［２］的结论，并得到了若干新的结果．更多还原

【Abstract】 his paper further studies some problems discribed in the book "Introduction to Optimal Trajectories" written by the first author in 1989. Here we improve and supplement the main results in the note[2],and get some new conclusions.更多还原