【摘 要】
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BAL troughs in BAL QSOs are thought to be the strongest observed signatures of QSOs wind.The variability of BAL troughs from SDSS provides very important clues
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BAL troughs in BAL QSOs are thought to be the strongest observed signatures of QSOs wind.The variability of BAL troughs from SDSS provides very important clues to the origin of the wind.
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