????:1???600??:????????????

2???????

3????????????

4?????????

5????????????

????????1??20? (??????????? ??)????????????20??,23??????????,??,??“?”??,????????????????????16?,??

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

19???,??????,?????????????20??20??????,?????????20??21???????????,????????,????,??????????????????????????20????????????????????????????20°C,??10°C?????????????15°C?????????,??????????????,??

???????,23?,????????23?,?????????????,24?27??,??8???12??????,??????????????14????16?,????????4?????????6?????????????,?????

??????????,??????????,??????,?????,??????????,??,??,???,???????,???(???????) ???:?????????????