?? ???:??,“???”?????????4???
????:1?????????:??????
2?????sn
3???????
4?????????????
5???????????
????????10??????????17????(??????????)???10?????????????,??????,???????????????????????
??,??????????,????????,??,?????????????,?,??????
“???”??????,???????????????????????
??
???????????,???????????????,??????????????????????????
????
???????0.25????;
??,?????????????15%;
????;
???????????????“????????????”?????????
????????,????????,?????????,???
?
??????????,???100??????????????????????,??????????????????,????????????35???????170???????,???????????????????????????????????50???????????????,????????????100????????,??????????,????????????????????????????????,????????????,???????,?????,????????????
???,??“??????”?????????4?????????????????????????????“??????????”,????????????,????
??,????????,???????????????????????,??????9????,??????????????????????????????????,????,???????????,??,????????????????,????,???????????????????????,?????????????,???,??
(?? ???????) ???????:???????????????