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

2????????

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

4??????????

5???????

????????????2????20??????? ??????????19???????,??????,??????,??

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

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

??,1??A?????????????4.95???,?????????????????20%?

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