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我国航天计划的下一个目标是登上月球,当飞船靠近月球表面的圆形轨道绕行几圈后登陆月球,飞船上备有以下实验器材:A.计时表一只;B.弹簧测力计一把;C.已知质量为m的物体一个;D.天平一只(附砝码一盒).已知宇航员在绕行时及着陆后各做了一次测量,依据测量的数据,可求出月球的半径R 及月球的质量M(已知万有引力常量为G)(1)两次测量所选用的器材分别为______、______和______(用选项符号表示);(2)两次测量的物理量是______和______;(3)试用所给物理量的符号分别写出月球半径R和质量M的表达式R=______,M=______.
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