? ????5.6????????????

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