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

2?????vx

3???????

4????????????

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

????1???2??????? ????????,“???”??????“????”,????????“???”,?????????????,??????,???????

????“??”?

???????????????,??????????????:“???,??,????!”????????????????,??????????????,????????????,????????????????????,???????????0.07????0.25?????????????,??????70????????,?????????200??????????,???????????????

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

??????:1.?????,?????????????????????????,??????????,??????,???2.??????,???????;????;????????????????????;????“???????????????????”???

??????????……

???????,???????????????,?????????,???????????????????,????????1000?“????”????,?8??,?????????“?????????”???4???????????????3??????????????????151??,????????????300?????????,???

?????“?????”???????????:??

??

“??????”??????????

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

??????«????»???:???,??????????????????,??,???????????,????,????,??:

(?????)???5?,????2????;

(??)??15?,????5????????

?????????????????“??????????????”,??????????????????????????????«????»??(???)????????????,??????????????????????

??????

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

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