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关注：1
2013-05-23 12:21
求翻译：Since the jet flow in its positive flow direction is additionally slowed down by frictions and hence more kinetic energy is converted fromthe jet to the bucket, there is ηf < 0.是什么意思？ 待解决
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Since the jet flow in its positive flow direction is additionally slowed down by frictions and hence more kinetic energy is converted fromthe jet to the bucket, there is ηf < 0.
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