????????????????????

????:??????????:???????vx

??????????9???5???? (????????? ???)???????????????????5??(???????????????“???????”)??????????????????“??????????”????????????????,?????“???”???????????????????????

???????“????????????????????????????”????????????“??”??? ? ????? ?????????????

?????????,???????,??,??????????????????????2.4????????1.7???????,????,???????????????,?????????????????????????????“???”?

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

??????????????? ? ? ????

????,?????????,?????????????????,?????????,????????

?,??,????????????????

???????,???,??????????????,???????????????????????????????????,???????

???,???????????????????????“????????????????”??“??”,??????????,????????????,???????????????????????(?????????????)

???:?????