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2021-07-03
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2021-07-03
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2021-07-03
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2021-07-04
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2021-07-09
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2021-07-03
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2021-07-03
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2021-07-03
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2021-07-03
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2021-07-03
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(3.14*D*D/4) * t * 2300 = xx kg
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2021-07-03
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2021-07-03
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