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