A.SaO2<85%,還原Hb<5g/dl B.SaO2>85%,還原Hb>5g/dl C.SaO2<85%,還原Hb>5g/dl D.SaO2>85%,還原Hb<5g/dl E.SaO2<85%,與還原Hb無關(guān)