????:1????????:????800

2???????

3??????????

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

5?????vx

??10??6???? ?,??????????10?????5????????,???????«???»(???)???

???????????????????:?????????

??????,??????????5???,????????,?????????????,???0.14%,??(0.08%????????????????????????)?

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

?,???????????????????????????????????????????????????????8?????,??

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