3.9???“??”?????????? ???????“????”

????:??????600?1200:??????

?????“??????”??????????????:????????????????????????????????????“???”??????????????3.9??????????????????“??”,????,“??”?????????????????????????,????????????????“?????????????”?

???,???????«????????????????(?)»????

2??21???,?????????????,???????“?????”“????”?????,“?”??????,????50?,???????????????????????,???3.9?????????????????????(???????????????? ??????? ?????? ?????)

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