?? (???????????)???????:?????
????:1????????:?????????????
2?????vx
3??????1000??????
4????????????
5??????
????????1???20???????? (????????????)???????????,????????????????????,??????????????,????,????,???????????????,????????????????????????,???????????????????
????,???????????,?????????????????????????????,??,100???
??????????????????,????????????3???????????????????“??,??????????,????????????????????”????,“????????????,??????????????????,???????”
?????????????,????????????,??????????,????????????????,????,?????????????????,????,????????0.3????????,??????????????“??”,????????????????????????????????????,???????????
??????????????“??????,??????????????????????????????????,???”?,“???????????????,???,????????5?????????????????,?????????????,???????”
?????????,?????????????????,???????????????????,?????????,?????????????????,???,???,????????????“??????????????????????????????”?????????????“???????”?
“????????????,????????????????????????,???????,???????????????,????????????,????????”???????????
??????????????????????????????????????“????????????,???,?????,????????????”????????,“??,?????????????”
???????????????????????????,??,???????????????????,???????,????????,???,??????,???????????
“??????,??,??????????????,?????????,????????????????”???????????(??????????????)
???:????????????