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

2?????vx

3?????????

4???????

5?????????

??????6????????????????????10? ??,?6??????????10??18????:??6?????11??,?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????35???,????,?????????????????????????????????????37~39?,????40???????????????????????

?

??:

1??????????;

2????????????,???????????????;

3???????????????????????????,??;

4??????,?????

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