郁证的主要病因是（）

A.情志内伤

B.感受外邪

C.内邪壅盛

D.胃失和降

E.肝气上逆

were the majority of Self Optimization related feature？（）

A.PCI自配置

B.Automated neighbour configuration-ANR 

C.Energy savings 

D.Cell Outage Detection and Outage Mitigation