???4???????????????,????,??????????????????????,???????????????????1?,???,?????,???

??,8??????7?4?,??????????????????????,????4???30??,????????????????????1214????????????

??,?8????????7????????4?16???????????,????,???????,??,?????,?,??,?????????

8??7??????????5??16??????????????,?,??????????????????????????????????,????????????(? ?? ??????????????????????? ??? ???????????????? ?)

????????????????:??????????

??“???????”????

?? ????????????? ??????

????:1????????:????????????

2?????v

3????????

4???????????

5???????

???4???????????????,????,??????????????????????,???????????????????1?,???,?????,???

??,8??????7?4?,??????????????????????,????4???30??,????????????????????1214????????????

??,?8????????7????????4?16???????????,????,???????,??,?????,?,??,?????????

8??7??????????5??16??????????????,?,??????????????????????????????????,????????????(? ?? ??????????????????????? ??? ???????????????? ?)

????????????????:??????????