center reference造句

• Based on four different reference frames , namely absolute angle synchronized reference frame , relative angle synchronized reference frame , reference frame in which some machine is taken as reference machine , and inertia center reference frame , methods of forming linear space model of multi - machine systems are introduced
  摘要介绍了多机电力系统在4种参考坐标系：绝对功角同步旋转坐标系、相对功角同步旋转坐标系、某一机组参考系和惯性中心参考系下的线性空间数学模型的形成方法。