7????

?????????2.1 ????? ??????28 30 ????65%???????????3%????2.5%?95%???????0.25%??2.2 ????? 112 L/min???????2?????????60100 mm Hg8.013.3 kPa????????1 cm????????1015 s???????3????????????1??????2.3 ???? ??????????????????????????????????????????????2.4 ??? ????????1????????2448 h???2.5 ?? ??????23 h30 L???50 L2.6 ?? 2448 h??2.7 ?? ??? 4 h????2.8 ? ????4872 h?????????????????????????????????????1012?????????????89 mm??1.5 cm??????1015 min?3?13?16??2?1??10???????1????????