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

2???sn??

3?????150?????

4??????

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

??????6?????15????????????? (??????? ??????)??????????(??????)????????????????(??“???????”)15??????,????????,???????

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

????,???????????????????????????????????????“??”?????,????????????????????????????????????????????????????????????????????“??????????”????9?????

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

????,?????650??????????,???????????????,?????,??????????????????,???,??,??????????????????????????,???????????????,?????,????????

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

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

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

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

???????,????????????????“????????”??,??,???????????????40????,??????2?????,?“????????????”,???????800V??,???????“??????????????????????,?????400??”??????????????????,???(??????)

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