When should the project baseline be changed

A) It should not he changed.
B) Only for changes that have been approved by the change control board.
C) At each project team meeting.
D) For all implemented changes.

认知失调理论的代表人物是（）

A.费斯廷格

B.海德

C.班杜拉

D.贾尼斯

E.霍夫兰