A.3~10cmH20 B.5~12cmH20 C.8~15cmH20 D.10~20cmH20 E.15~25cmH20
A.<1.008 B.1.008 C.1.010 D.1.012 E.1.018
A.0.5~1% B.1~2% C.2~3% D.3~5% E.5~10%