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2???????

3?????????

4????????

5?????????

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?8??????6??????????????????,????????????????????????????????,?????????????;??????????????????????????????????????????????????????????,????????

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6-7????,???????????????,???????????????????????????????,???,????????????????

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6??6????8?7??8?????,???????????????????????????????????????????????????????????????????????????????????,????,??????????????(50~90?)?????????????????????4~6?(???1)?

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6????7??08????8?08?,?????????????????????????????????,?,????????????????(50~70?)(??2)?

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6???????8??????????8????9??8??,?????????????????,?,???????????????????(50~90????????????????)(????3)?

???????????3 ??(6????8??8?-9??????????????8????) ??:??????????