关于地球同步卫星下列说法中正确的是 A.它一定在赤道上空运行b.它的高度和运动速率各是一个确定值c.它的线速度大于第一宇宙速度d.它的 Template




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tomski关于地球同步卫星下列说法中正确的是 a.它一定在赤道上空运行b.它的高度和运动速率各是一个确定值c.它的线速度大于第一宇宙速度d.它的 coloring