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- 5两个同心球壳,内球壳半径为R1,均匀带有电荷Q;外球壳半径为R2,壳的厚度忽略.(大物)
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- 7一个圆柱体积50.24,底面半径2cm将它的底面分成若干个扇形,在裁开拼成和它等底等高的长方体,表面积增加多
- 8I cannot forget the time __ you have beento guangzou.
- 9i am busy cooking now. i ____until this evening
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