总体的要求是（）。

A.大量的

B.同质的

C.随机的

D.固定的

E.对称的

All of the following are examples of a source of scope change EXCEPT ______ .

A．a variation in government regulations

B．failure to include a required feature in the design of a telecommunication system

C．discovering a need to engage in bottom-up cost estimating

D．introducing technology that was not available when scope was originally defined