?? ???4.2?? ????18???????

????:1?????????:????????
2??????????????
3?????????
4?????????
5?????????
?10???27?? ???,?:10??27?14??????????19??(???????23.36??,??120.48????)??4.2?,???18?????

?10???27?? ???,?:10??27?14??????????19??(???????23.36??,??120.48????)??4.2?,???18?????
????:1?????????:????????
2??????????????
3?????????
4?????????
5?????????
?10???27?? ???,?:10??27?14??????????19??(???????23.36??,??120.48????)??4.2?,???18?????