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???????2?????????????,???,???????????????????????,2??????????????????

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??????,??????14~15?????????????,???,??????????????????????????????????????????????????????????,18~20??????????,??????????????????,????????????????????

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

?,??????????????15??????????????????,????15°C,????????5~8?,????

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

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

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

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

??????,???????????:?????

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