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

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

3??????

4?????vx

5????????

??2??????????19???????? (????? ????? ????)?????????????19????????????

??:??????????????????????,?????????????????????????????????????

??:?????????,?????????,??????????????????,????,???????????????????????“???”?????????????????,???????????????????????????????,???????????????“??”?,????

????????????????????,?????,???,???6???????????,???????????1.2?????????,????,?????????????????????(??????????????) ?????????????:?????