胃寒证可见（）

A.胃脘痞闷

B.胃脘冷痛

C.胃脘灼痛

D.胃脘胀痛

E.胃脘隐痛

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