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

2???mm??

3???QT???

4???????????

5???????

??

????

??????????6??17???? (??????????????)????????????????:5???????,???????????????????????????????????????????????????????????????????????????????“??”?????????,????????????,????,??????,???????,??????????????????

?????????????????????,?????????????15??????1800?,?????????????????,?????????????????????????????????????????,??18.36??????????????????7804??,????1585????????????,??,??????????????17.62??????????????????,?????29.42???

????????,??,??????????,???????????,????????,????,?????????????,???230???,??700???????23.1??,????7.8???

???,?????????????????????????????,??????????????????????????????????????????????????,?????(???????????????) ???????:?????