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

2?????90????????

3?????sn

4????????

5????????

???????????11??22???????????????????? ???????????????22????????????????????????,??????????????????????????????????????,?????

??????,?????,????????????29????,??????????????????????????15?????,????

????,???????????????,??????????,????????????,???????????,??????????????818.6????????,??????????????48.8%;????????,????????488.5?????,??????78.6%?

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