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

????:??????????:??????

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

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

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

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

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

????????:????????