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1.求有关中心星体的物理量例1一飞船在某行星表面附近沿圆轨道绕该行星飞行,认为行星是密度均匀的球体,要确定该行星的密度,只需要测量( )
1. Find out about the physical quantity of the central star. Example 1 A spacecraft orbits the planet near a surface of a planet in a circular orbit. The planet is considered to be a sphere of uniform density. To determine the density of the planet, only measure it.