????:1?????????????:???????

2????????????

3??????

4????????????

5??????????

??????????????????(6?????????????19??)??,?????????????

?3.46??,????,

??????????????????????????????????????????????????7????(???????)2.13??,????????????,???;

??????????????????????????????4????????(????????)0.69??,??,??????,????????????????????????????,??;

?????????2??????????0.64???,??,?????

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