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

2?????????

3?????SN????

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

5?????24????

?????????12????12??????????? ??????????“??????”??????,??????,??,??

??,?????,??,??,???;????????????????,????????,????????????????????????????????????????,?????????,??????????????

???,?????????????????,?????????????,???????,?????????????,???????????????????????«????????????????????»«??????????»«????»???????????????,???,?????????;??????????????;???????????;??,????????????????

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