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