?? ???????????? ????5.6?
????:1?????:??????
2?????
3?????vx
4???qt????
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???????????(???) ????:???