白矮星是普通恒星燃尽后形成的体积很小，质量密集的残骸。
White dwarfs are small, dense remnants of normal stars that have expended their fuel.
采用浮选法可除掉粉煤灰中部分未燃尽炭，在降低了含炭量后，粉煤灰的质量得到很大提高。
Through removing partial unburnt carbon in fly ash by flotation, the quality of fly ash can be improved.
采用浮选法可除掉粉煤灰中部分未燃尽炭，在降低了含炭量后，粉煤灰的质量得到很大提高。
Through removing partial unburnt carbon in fly ash by flotation, the quality of fly ash can be improved.
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