?? ?????“??????????????????????”?????
????:1????????:???????????
2??????????
3????????
4????????
5??????????
?????????????9??????21????????? 9???????????21??????????????,?????“?????????????????????????”????????????“????”???????????????????????????????????????????,????,?????,???????????????????????????????????????????????????????????,??,????????????????,???????????“??????????????????+????????????????????????”??,??????“??????”??????????????????????????????
????????
9???21?????,????“????”????????????(????)????????60?,?,?????MCN????????????????????“?????????????????????????”?“??????????”?????????????,??????????????????,?????“??”??????????????,?????,??????????????(??????????????????)
??????:???