循行中"贯脊"的经脉是（）
A.督脉
B.带脉
C.足少阴肾经
D.足太阳膀胱经
E.足少阳胆经
参考答案：C
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 updated.
形成流化床必须具备哪些条件？
