2015年10月17日中国在西昌卫星发射中心成功发射了亚太九号通讯卫星，该卫星运行的轨道示意图如图所示，卫星先沿椭圆轨道1运行，近地点为Q，远地点为P，当卫星经过点P时点火加速，使卫星由椭圆轨道1转移到地球同步轨道2上运行，下列说法中错误的是（ ）
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图示结构，用位移法或力法计算时，两种情形未知数数目的对比（）。