???2????21?? (????????????????? ????????)?????????,????????,???????????????????????21??,??,??????,?????????????????????,????????????????“????????????????????”??????????,????????????

??????“?”??,???(????)

??????????????2?????????H???????????,?“???????????????????”?????????????“???????????”????????,?????????????????????????????????,??????????????????????????,?????“???????????”????????????????????????,???????

?,???,????????????????????“??????”?,???????????????????????????????????????,???????????1??,?????????360°??????????????????????????,?,?????????????????,????????

???????,“???????????????”????,????????????,???????,???????????(???????????????????)

???????:????????? “???????????”????

?? ??????“????????”????

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

2?????????

3?????????

4???150????

5???????

???2????21?? (????????????????? ????????)?????????,????????,???????????????????????21??,??,??????,?????????????????????,????????????????“????????????????????”??????????,????????????

??????“?”??,???(????)

??????????????2?????????H???????????,?“???????????????????”?????????????“???????????”????????,?????????????????????????????????,??????????????????????????,?????“???????????”????????????????????????,???????

?,???,????????????????????“??????”?,???????????????????????????????????????,???????????1??,?????????360°??????????????????????????,?,?????????????????,????????

???????,“???????????????”????,????????????,???????,???????????(???????????????????)

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