2737* +x x EV +f{i +Eɮ * =M S ɮ ElEl **1** **w*** vƴ bh M ɴE * i Vɱ Hx **w** ɨɱx n vɱS{ɮ * Z Vɴɮ ɽxɪ **2** iE h vƴ PiɱҺ < * +i {f < ɴE **3**


Oliұ MS +M Oliұ {fS +M +MS +vɪ