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???????PaO2?????PaCO2??????????????????
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1???????Sa O2?????  ??
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2? ?????????????????????????
3?? ??????????????dK???
4? ??????????????????????
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???????(PaO)?????(PaCO)???????????????
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(3)?????????????????????????
2.???
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(2)??????????????
3.??????? (1)???????????????????????????????
(2)????????????
4.???????????
5.???
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