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