??????????????????????????=??????/??????????????????1.0???0.8??????????????????????30 mmHg?4.0kPa???????????0.6????????????????????????
?1????1??????????<0.6???????????????????1 ?????<0.6????3??????????????????????
?2?1???????0.6?0.8???????????????
?3????????0.8??????????????
?4?????????????????30mmHg?4.0kPa????????????????????????
???????????????????????????????????????????????????????????????????????????????????????
