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