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

2????????

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4??????????

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

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

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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