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

2???????vx

3?????????

4??????v

5???????

???2???????????12????????? (???????????? ???????????????????)????????????,13????6?????????????????,???????????????????????,?????????????

????????????????,????,?????????75.03????,????

???“??”????????????,???????????????????????62.90???????????,??,?????,?????,????,??

??????,????,?????????????????????????????103.81??????,??,????????????????

?????,?????????“?????????????”?,???????????????????????????????????1:6?????????????????

????????????,???“??????????????????”?????????????“???????????”????,???????????12????????????2:1??????????,??????????????????“???????????????????”?

13?????????????????????????,?????????????????????????????????????,????????????????????,???

????????????,?????13?????????????????????,31????U???????

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

???????????????????U????????????,???????????,????????

??,??????????????4×6??????????????4×7.5??????,???????????????????,????????1?????2????????

??????????????????????7.5??????“?????????”?????????????????,??????????????????????????????,??????????????????????????????????,??(?????????) ??????????:??????????????