What is predicted about solar energy iCycle 25( )
· Cycle 25 may be stronger thaCycle 24.
· Cycle 25 may be weaker thathe following decades.
· Cycle 25 may be as weak as the period of 1645 to 1715.
· Cycle 25 may be stronger thathe period of 1790 to 1830.
出自:运营管理