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

??

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

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

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

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

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

???:???

?????????

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

????????