?? ????????2000??????????????
????:1???????:??????
2???????????
3??????????
4?????
5???????
1??????????????????17??????,???(?“???????????”)?,?????????,???2000???????
???,?,????????“?????????????????????”,????,??????????????????,?????????????????????,??????????
???????????????,??????2000???????,?10000psi(????),????690??????????????,??????????????46?,????30??,?????????????????????????????????????????????????(????????????? ???????:??)
????????:??????