有两个�属球,一个是半径为2r的空心球,另一个是半径为r的实心球,两球间的距离r>>r。空心球原来带 上学吧找答案 Template




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tomski有两个�属球,一个是半径为2r的空心球,另一个是半径为r的实心球,两球间的距离r>>r。空心球原来带 上学吧找答案 coloring