Administrative closure should not be delayed until project completion because

A) useful information may be lost
B) the project manager may be reassigned
C) project team members may be reassigned by that time
D) sellers are anxious for payments

下列各穴中，常用于保健并具有强壮作用的是（）

A.关元俞

B.肾俞

C.脾俞

D.足三里

E.气海俞