?? ???? ?5.6????????????
????:1?51pc·mc??????:??????
2??????
3???????
4??????
5??????????
?1?????30???????????? ??,30??????????,??????5.6?,??????????21????????6.4??
????????,30???????10?11??,????????5.6??????????,?10?,??????5??,?????????????????10???4????????,???3.2????4.3?????,??
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????????????,30????10?11????????????5.2???????????(???) ??:??????????????