645* +P n h vi * J ={ɺx MhɦH * |M] nS i * ɴɶr Vhxɪ **1** **w*** V +h S xɨ * E {h E vɨ * E ES ɨ * xɴɮ ɨ E **w** Vl Eix xɨP * Eʮi xɱVV S nɺ * E lƤɱ * i]i {ɶ ɴɤvS **2** i +M ɺi Ih * +iɮ n vʮ `h * +{h S i iɪS Mh * Vh h J] ɺiS **3** x M bɴ +ɸɨ * ={Vɱ ES vɨ * +hE x Eɴ ɨ * BE {֮ xɨ ʴ`S **4** n{ְ xɮɪh * MɪS ɨ x * H +i {ʮ{h * iE h Mh +ɨ **5**


Oliұ MS +M Oliұ {fS +M +MS +vɪ