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

2?????

3???????????

4??????

5????????????

????? ?????????????6??25??18?????????????????:

6????17????,??,??????????????????????????300~560??,????????????600~790??????,6?25??27???????,??????????????????????????????????????,????,?????????????????????????????????????????????????,?????,???????

????,6???????????25??20??26????????????????20??,?????????????????????????????????????????????????????,????,???????????????????????????????????????????,????(250~260??????????)?????(??30~50????????????,?60?),???????????????

??????????:

1.??????;

2.?????,??????(??????);

3.??????????????????????

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