The characteristics of a Chinese modern geocentric 3D coordinate frame;
中国地心3维坐标框架应具有的特点；
The coordinate frame called map is a world fixed frame, with its Z-axis pointing upwards.
该map坐标系是一个世界固定坐标系，其Z轴指向上方。
The dynamic equations of flexible spacecraft are derived by introducing a moving coordinate frame.
首先建立了采用任意浮动参考系时的柔性航天器动力学方程；
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