APPd

һ pd

̫ƽ܇W(wng) > l(f)(dng)C(j)œ

܇l(f)(dng)C(j)œ

܇ģDƬ

ʾ

_

֮ܲ鿴܇ҵĺ܇тĻ؏(f)Ŷ

Ҫᆖ(wn) ᆖ(wn)