激发后的原子退激时放出（）。

A.轫致辐射

B.湮灭辐射

C.特征X射线或产生俄歇效应

D.光电子

E.康普顿电子

Which of the following statements relating to assumptions is inaccurate

A) They are factors which are considered to be true, real or certain.
B) They affect all aspects of project planning.
C) They are progressively elaborated.
D) They limit the project team’s options.