??12?????20?? ???,????20?:

12??19??21???????15????????????,??????????????????????????,?????,?4???

???????????????????,????????????????,?????????????????????????,???????????????

?:?????????? ????:??? ??“??????”????

?? ??????:???????????,?????4?

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

2??????

3????????

4???????

5????????????

??12?????20?? ???,????20?:

12??19??21???????15????????????,??????????????????????????,?????,?4???

???????????????????,????????????????,?????????????????????????,???????????????

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