A quasar which resembles a quasi-stellar radio source in many optical properties, but is relatively radio-quiet. QSOs appear to be about 100 times more numerous than the strong radio quasars.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。