Which of the following statements is correct ( )

A．The definition phase results in the Software Requirements Specification

B．Testing is optional in software life cycle

C．CASE tools can only aid in the design phase of a software life cycle

D．A change during a later phase does not require the documentation of all earlier phases to be up-dated

加味桔梗汤治疗下列何证（）

A.肺痈溃脓期

B.肺痈成痈期

C.咳嗽痰热郁肺

D.实喘痰热郁肺

E.肺胀痰热郁肺