“periodic variation of corona”的概念、定义、翻译、参考文献-科学参考

单词	periodic variation of corona
释义	periodic variation of corona Encyclopedia 理学太阳物理学释 periodic variation of corona日冕周期变化日冕的形状同太阳活动周期有关：在相对黑子数极大时，日冕近于圆形；而在黑子数极小时则较扁，赤道区延伸较远，两极区延伸较近，且有羽状物。因此，日冕的形状也与黑子数一样，有11年的变化周期。
随便看	blood parrot cichlid blood pathogen inactivation blood perfusion blood perfusion imaging agent blood plasma blood platelet blood platelet disorders blood platelet of domestic animals blood pool blood pool imaging blood pool imaging agent blood pressure blood pressure measurement blood pressure measurement by auscultation blood product blood product control blood product depots blood products in war blood purification materials blood purification system ancillary device blood purification system and instruments blood purification technic Blood Relations blood routine examination blood routine examination in children

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