?? (???)???4?????“??”:???????
????:1??????????:???????
2???????????
3??????v
4??????????
5?????????
?????1??????31?? ??:???4?????“???”:????????????????
????? ??????????? ???????????????? ?????
????????,????????????,????????????,????“??????????”?,????,????????????
???(???)?? ???????? ???????????????60??????????,??????60?????????,???????10?????,???????????,?????????????(??)?????????????
“??DN500????????,????????????300?????,??”1????????????25?,?(????????????)????
“?????????????????????????????????……”??,“?????”?????????????????:“????????????????????,????,???”
????,???????????“????????4???????????????????????50???????2??,?????????????????????????????,?????”?,???,?????“????”?
???????(????????????????)?????????? ??????????? ?????????,“???????”????DN500??,??,??????????????,?????????????????????????????????????????????,???????
???,44?????????????(????)?????:“?????,??????????????????,????????????????,?????”
???(???????????)?????????????,???,???????????????????????,??????????????,??,???????????????????????,???????,?????
????4??,????,?,???????????????????
??,??????????,?????????????,????,???“??????”???????(????????????????????????????)
????:??