????:1????????:???????

2???????????

3?????????

4???????

5???50????????

??“?????????????”??,????,??????????????“???”????????“??????”??????????????“??”,?????????????,???????????????200?????????,?????????????30??????,??????????,????

“????????”?????????????????“???”??(?????????)?(?????1949?????????,?????15??????)??????????,??????????????“???????????”???

“??”??,?????????????“??????????”,???,???????????,?????“?????????????????????”??????,“??????”??,??????,???????,??,?????????????????,????????????,???????????????,???????????

????,?????????????,“?????”?????????“??????????????”???????,?????????????5????“??”?????,???????????“????????”,???????????????????????????“?”?????,??,????

??????????,??????????????????????????????????????????????????,?????,???????????????????????????????????????????????,???????????????????(250~800???????????)???????????(???30~60??,?????????????80?????),??

??,?????“????”????????,??????????????????????,????

???????,??,??????????,??????……???????,????“??????????????????”??,?????????????,????????,??,??????????30°C?

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

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