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