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

2???????

3??????????

4???????400?????

5???????

??8???4???????? (??????? ???)???????3????,?,???

????????4×100???,???????????????????????3???????????????????37?55,????????????????????????3?????????37?43????,?????????????????,??????????

????????????8?????????3????,????????????????????4x100?,????????????????????????????????????????????(??????????)????????????3?37???55??????,????????????????????

?????????????,??????????,??????????,?100????????????????57???82,??????

????????????,???,?????????????????????,???????????????0.12????????????

??????8????3??????????????,???4x100????????,??????????????????????3?????????37???????55?????????????,????????????????????????????????????

????????,?????????80?,?????????,?????

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

?????100????????200????,????????????????????,?,???????,????

????????,??????,?“???100%,??????????????99%”?

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

?4????,???????????????,?4×100??????????????,??????????????????????“????????,?????????,?????”(????)

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