???3.1?????????:????,????????
?2???7???? ????????????????7???,???2??????????????35????????????3.1????????37.14?,??127.76??,??????9??
?????,????????????(P?)??4.2???????????????,??????3.1??????????????
??????,????,???,????44?????,?,?????????????????
?,?????,?2???54??,??23???????3??????????,??? ??????????:??