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

2?????

3?????vx

4???????

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

????11??????????????????28???? (???? ??????)????“????”????28????????????????????????????????????????“??????????????????????????????”???,?????

????“?????”??? ???? ?

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

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

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

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

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

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