????????2000??????????????
1???17??????,????(???“??????”)??,??????????????,????????????????2000?????
??????,????????,????“???????”,???????????????,????,?????????????????????,?????????
???????,????2000???????????,????10000psi(?????????),?690?????????????,?????????46?,?????????????????????30??????????????,???????????????????????(? ?????????:???)
??:?????????????????????????????????????
??
???:????