?????????? ??????????

??????????,??????,???????,???

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

?????????,????,?????????????,????,????????,?????????????

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

???????,?????,???????????

??,???????

???,???????????????????,??????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???????,?????????,???????????????

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

???????????,????????????,?????????,??????;?????,???????????,???????

??,?,????,??,????????????,?????,?????????,?????????