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

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

3??????500??

4????????

5???????

?????6??16? ?????????????????????,?????????????6?????????????16???????18?????:??????????,6??????16?20?????17????20???,??????????????????????????????????????????,?,?????????????????????????????????????,?????????(250~270?????????????)???(?????30~50?,????????????70????),?????

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1.??;

2.??????,?;

3.?????????????????,???????????????????????????????;

4.???????,????????????????

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