4、投资状况;投资风险;风险预警;BP-Logistic混合模型I-----------AbstractGlobaleconomygrowingdemandforenergydevelopment.Fortraditionalenergy
sourcesaredepletedandtheincreasednewenergydemand,thenewenergyhas
becomeanimportantpartoffutureenergystrategy.Asahigh-tech,highinvestment
and