????:1??????:??sn??

2?????????

3??????

4????????

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

?12?19? (?? ????)????,?“????????”????19?100??????,???????????????????5.4??,???20???3?,?????

12??????19?,?????“????????????”????(?)

12??18?????????????????????????????????????,???“?????”??23?,?????????,???“????????”?,???????????????????????

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??????????12???????????19??,??4.3?????????????,????????????2.5%,????4.5????,???

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