?? ????????2000??????????????
????:1?????:??????499??
2???????
3??????
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5??????????
????????1??????????17?????????? (????????????????? ???????)????????(????????“????”)?17????,????????,?????????????????????2000?????
1???????????????????17?,????????2000??????????????(??????????????)???????,??,?????????????“???”,??,??????????????,?????,??????????????????
?????????,??2000???????????,??????????????????10000psi(???????),?????690???????????????,????46?,???30?????????,?????????????????????????????????????
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