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单选 得分/总分半径为R的球沉入水中,球的上部与水面相切,球的密度与水相同,现将球从水中取出,需做多少功

单选题
2021-09-08 14:16
A、4-Rg
B、4-R.g √4 00/4.00
c、4xRg
D、4-R.g
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正确答案
B

试题解析

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