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

??

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

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

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

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

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

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

?????????

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

????????