? ????????????5.6????
???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???(?) ??????:??