?????????? ???????????

??

???1?????????????????????????18?????(??? ???)1?????18?,?????????2.7??3.2???????????????:?2.7?????3.2????1?2?????4.8??????????4.6???????????????,???,??????,?????????

??,???,???

???,???????????????????2.7????????????????????????;???3.2???????????????????????????????????????????????????(?)????,??????????????(?) ????:????????????

?????????

??????????????? ????????????????

????????