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

2?????300????

3???????

4????????????

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

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???,???,???????15~16???

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??????????????,??17????16?,????????,???????????????????7~8??????

???????????,15?????????,???,??????????????????????????16????????????,?????????,???????????15????????,?????????????????????????????????20????

???????????,?4???????????10°C??,16?????????????????????????????17°C;??????15??26??????????????,??????10???????,????????

??15????,??,????????

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