“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	database industry database integrator database language database log authentication database logical structure design database machine database management automation database management system database management system, DBMS database marketing database middleware database normalization designing database of engineering survey database of geological survey database of invasive alien species in China database of mineral resources potential evaluation database of national major urban environmental geological survey database of regional geochemical database of surveying and mapping datum data base of values and facts database operation managemen database outsourcing database performance evaluation database performance tuning database physical structure design

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