???-17.8? ????????2???35????

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

??2?????8???????(?????? ?)?,???8??????????????????????,????-17.8?????????-4.6?,?,?35?????????2????

8??,?????????????89?,???????57??????,????,???5?????????,????1?,“??”???????

???????“???????”,?????,?,?????????,?????,????????,??????????????????????,????????????????????,???????????0?????????,???2????,??68??

??,????????????????8????-4.6?????????????2???????-4.6??,??????????????1990??2??1????(-6.2?)?

???,????8?,???????,????9???????????-3???????????-5?,????????????,???-6?????????????????????-8?,??10?????????,???-1??-3?,???,?????-4???-7?,??????????(????????) ???:????