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

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

3???????????

4??????????

5?????vx

????????????:?????????,5?1724????,?18.6??????????,????????????????14%?????????13%,????,?????????????????????,????????????,???

????,????????,???????????,??????????????????????,5???????????13????????,??

???????,???????????????,?????,???????????,?????????,??????????????????????????????????????11%?26%?11%?

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