?????

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

????????,??????????70%?

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

????,?????

???????????????????

????,?????

?????????,??????50%?

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

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

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

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

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

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

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

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

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

???????????,???????????15s?

?????????,????????45s?

??????50%????????????,?????????????????20s???,?????????

??????????????,?????????,?45s????????

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

?????????,????????70%?????

????????????????,???????,??????,????????30%????

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

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

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

???????,????!(???)