????:1????????????:300???????????

2???????

3???????v

4?????????

5?????????

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

??3.46???,??,

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

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

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

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