????:1???????vx:?????

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

3????????

4?????

5?????

?????????????????8?????????16? (???)??????????,????????????????,??,????????????????2019?11.9%?9%???18.7%,???????7?????????????????,???????

?????,?????????????,?4335??????????????,????262????????16????,?????????,?????10???

?,??????????????,????0.0016?????????????????0.01,???1/3???????1/10?

??????????????????????????????????????,???????????????19?????????,?20%? ???:???