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

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

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1.?????;

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

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

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