??????11???????????2????????????????????? (?????????????)11???????2??,????????????????????,?????????????????????????????????????????

????????????????“?”??,??????

11?????2?,“??????????”??????????????????????????? (???????????????????????)

??,????????????????(50?????????????)??????????????“????”???????“?”??????

??“?????????”???????????????

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

????,“???”?,??,???????????????,???????(??????????????????????)

????:?????????????????? “?????”_????

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

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

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

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

4????????vx

5????????

??????11???????????2????????????????????? (?????????????)11???????2??,????????????????????,?????????????????????????????????????????

????????????????“?”??,??????

11?????2?,“??????????”??????????????????????????? (???????????????????????)

??,????????????????(50?????????????)??????????????“????”???????“?”??????

??“?????????”???????????????

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

????,“???”?,??,???????????????,???????(??????????????????????)

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