怎么比较地球上线速度大小?

怎么比较地球上线速度大小? 近地卫星,同步卫星,地球上的物体加速度,速度,周期的大小比较 位移大小正负怎么比较,是绝对值么速度大小呢````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````` 这个怎么比较大小 负数大小怎么比较 怎么比较极性大小 怎么比较 大小 假分数大小怎么比较 燃烧热怎么比较大小? 这道高数题怎么比较大小? 离子半径大小怎么比较? 怎么比较势能大小 怎么比较电势大小 怎么比较大小 数列怎么比较大小, 位移怎么比较大小 怎么比较大小 百分数怎么比较大小