?? ???????????? ????5.6?
????:1???????:????600??
2?????v?
3???????????
4?????????
5????????
?1??30? ????????????,30?????,?????5.6??????,????????21?6.4??
???????,30?????10??????????11??????????,??????????5.6?????,???????10???????????,?5???,????????????10????????????4??????????,??3.2???4.3????????????,?????????
??,????,??????,????????
????,30????????10??11???5.2??????????????(????) ??:?????