????6.4??27? ???????????
??????????????1?????????21??????????? ??,21???17?,????????????????6.4??????????,??????????27??????,??????
????????????????,?????11?????????,??????55?????,??????????5??????
??????????????????????????????????????,????,?????,?????,???????????????????????,???????????????,?????????4???10???
?????????,???????????10???,?22???????????????????,??????????????????????????????
???????????????????,???????,????????????21???????????????????????,??????????????????,???,?,????????(?) ??????????????????:?????????