?? ?????±800??????????????????
????:1????????:????????
2????????
3???????
4?????????
5???????
??,?????????????±800?(??????????????????2?)??????????????????,?????????????70???(?????????) ??????? ????
??12????9?(?? ??????)?9???????,8??,?????“??????”????±800??????????????
??±800???“???”???????????,??,?????,??926.4??,????????????????????????????5??????????????????,???800?????????????????
???5????,??325.4??????35%,??625??????????,???????????????,?????????????????????????,???,????
??????,????,??????(???)
???????:??????????